Radiology Nursing Guide

Radiology & Medical Imaging — Clinical Nursing Reference

A comprehensive guide for GCC nurses covering imaging modalities, contrast media safety, interventional radiology, radiation protection, and MRI safety — with GCC-specific regulatory and clinical context.

6 Clinical Modules 2 Interactive Tools 10 Practice MCQs GCC Regulatory Context

X X-Ray (Plain Radiography)

Uses ionising radiation (photons) to create images based on differential attenuation through tissues. Dense structures (bone) appear white (radiopaque); air appears black (radiolucent).

AP vs PA Chest X-Ray

Feature	PA (Posterior-Anterior)	AP (Anterior-Posterior)
Beam direction	Back → Front	Front → Back
Film/detector	Anterior chest wall	Posterior (behind patient)
Cardiac silhouette	Accurate size	Up to 15–20% magnification
Setting	Radiology dept (standing)	Bedside / ICU / portable
Image quality	Superior	Reduced (scatter, lordosis)

⚠On an AP film, do NOT diagnose cardiomegaly — cardiac magnification is an artefact of projection geometry. Always note "AP film" in your documentation.

Portable X-Ray Limitations

Magnification artefact Patient positioning difficulty Reduced mAs/kVp control Scatter radiation to staff Rotation artefacts Lordotic projection

Staff should maintain a minimum distance of 2 metres from the tube during portable exposures and wear lead aprons when unable to leave the area.

Nursing Role

Ensure patient identification, remove radio-opaque objects (ECG leads when possible, jewellery), communicate exposure to adjacent patients, document clearly whether AP or PA was taken.

CT Computed Tomography (CT)

Radiation Dose Concepts

Unit	Measures	Clinical Use
Gray (Gy)	Absorbed dose (J/kg)	Tissue-specific dose
Sievert (Sv)	Effective dose (weighted)	Stochastic risk comparison
mSv	milli-Sieverts	Routine clinical reporting

A typical chest CT delivers ~7 mSv effective dose (equivalent to ~350 chest X-rays at ~0.02 mSv each).

Hounsfield Units (CT Numbers)

Air −1000

Fat −100

Water 0

Blood ~50

Soft tissue 30–70

Bone 400–1000+

Tissue	HU Range	Appearance
Air	−1000	Black
Fat	−80 to −120	Dark grey
Water / CSF	0	Dark grey
Blood (acute)	40–60	White-ish
Soft tissue	30–70	Mid grey
Bone cortex	400–1000+	Bright white

Contrast Enhancement Phases

Phase	Timing post-injection	Key Use
Non-contrast	Before injection	Haemorrhage, calcification, baseline
Arterial	~25–35 sec	Arterial pathology, HCC, aorta
Portal venous	~60–80 sec	Liver parenchyma, bowel, spleen
Delayed / nephrographic	~3–5 min	Urinary tract, renal lesions

ℹNursing: confirm IV cannula patency (18G minimum recommended) and injection rate (typically 3–5 mL/s) before CT with IV contrast. Stay alert for contrast reactions post-injection.

Nursing Pre-CT Checklist

Verify eGFR (contrast) Check metformin status Allergy history IV access confirmed Consent obtained Remove metallic objects

MR Magnetic Resonance Imaging (MRI)

Core Principles

MRI uses no ionising radiation. It exploits the magnetic properties of hydrogen nuclei (protons) in water molecules. A strong magnetic field aligns protons; radiofrequency (RF) pulses disturb this alignment. Signal emitted during relaxation is used to create images.

T1 vs T2 Signal (BOLD Principle)

Tissue	T1 Signal	T2 Signal
Fat	Bright (HIGH)	Intermediate
Water/CSF	Dark (LOW)	Bright (HIGH)
Muscle	Intermediate	Intermediate/dark
Cortical bone	Dark	Dark
Acute blood	Dark → bright	Dark

Mnemonic: T1 = "anatomy" (fat bright, water dark); T2 = "pathology" (fluids/oedema bright)

MRI Safety Zones (ACR Framework)

Public Area

General public access, no magnetic hazard

Transition Zone

Unscreened patients await screening here

III

Restricted

Supervised access only; fringe field present

MR Scanner Room

Highest field; only screened individuals

US Ultrasound

Uses high-frequency sound waves (2–15 MHz). No ionising radiation — safe in pregnancy. Real-time imaging of soft tissues, organs, and vasculature.

Key Advantages

No radiation Portable / bedside Real-time guidance Safe in pregnancy Doppler blood flow

Limitations

Operator-dependent Gas/bone attenuates beam Limited in obese patients Cannot image lung/bone interior

Doppler Modes

Colour Doppler: direction of flow coded red/blue. Spectral Doppler (PW/CW): velocity measurements. Used for DVT assessment, vascular stenosis, portal hypertension, cardiac output.

NM Nuclear Medicine / PET-CT

Introduces radiopharmaceuticals (radioactive tracers) that accumulate in specific tissues based on metabolic or physiological activity. Images functional information rather than anatomy alone.

Common Tracers

Tracer	Use
18F-FDG (PET)	Cancer staging, metabolically active tumours
Technetium-99m	Bone scan, V/Q scan, thyroid, HIDA
I-131	Thyroid cancer treatment/diagnosis

⚠PET-CT patients are radioactive post-injection. Minimise time near pregnant staff. Patient should avoid close contact with children for several hours post-scan as per local protocol.

Nursing: ensure patient is NBM 4–6 hours pre-FDG PET (glucose competes with FDG uptake). Check blood glucose <10 mmol/L before injection.

I Iodinated Contrast Media (CT / Angiography)

Ionic vs Non-ionic

Property	Ionic (High-osm)	Non-ionic (Low-osm)
Osmolality	~1500–2000 mOsm/kg	~600–900 mOsm/kg
Adverse reactions	Higher incidence	Lower incidence
Cost	Lower	Higher
Current practice	Rarely used	Standard of care

Modern GCC practice uses non-ionic, low-osmolality contrast agents (e.g., Omnipaque/iohexol, Visipaque/iodixanol, Optiray/ioversol) for virtually all indications.

Contrast-Induced Nephropathy (CIN) Prevention

!High-risk threshold: eGFR <30–45 mL/min/1.73m² significantly increases CIN risk. Discuss risk/benefit with radiologist.

IV Normal Saline 0.9%: 1 mL/kg/hr for 6–12h pre & post

Consider N-acetylcysteine 600mg PO BD (evidence debated)

Hold Metformin 48h POST-contrast if eGFR <45

Minimise contrast volume Use iso-osmolar agent

G Gadolinium-Based MRI Contrast Agents (GBCAs)

Nephrogenic Systemic Fibrosis (NSF)

!NSF risk: linear (non-macrocyclic) GBCAs in patients with eGFR <30 mL/min/1.73m² or on dialysis. Condition is debilitating and potentially fatal (fibrosis of skin, subcutaneous tissue, organs).

Current guidelines recommend macrocyclic GBCAs (e.g., gadoterate/Dotarem, gadobutrol/Gadavist) which have highest stability and lowest NSF risk. Avoid Group I agents (gadodiamide, gadopentetate) in CKD patients.

eGFR Thresholds for GBCAs

eGFR (mL/min/1.73m²)	Recommendation
>60	Standard dose safe
30–60	Use macrocyclic agent, discuss with radiologist
<30 or dialysis	Avoid Group I/II GBCAs; macrocyclic with caution + consent

Contrast Allergy Classification

Severity	Features	Management
Mild	Urticaria, flushing, nausea, pruritus	Observe, antihistamine
Moderate	Bronchospasm, facial oedema, vasovagal	Antihistamine + corticosteroid + O₂
Severe	Anaphylaxis, cardiovascular collapse, laryngeal oedema	Adrenaline IM 0.5mg, resuscitation

Pre-medication Protocol (Prior Reaction)

Prednisolone 50mg PO at 13h, 7h, 1h before contrast

Diphenhydramine (or cetirizine) 1h before contrast

Use non-ionic low-osmolality agent

ℹPre-medication does not eliminate risk — emergency equipment must be immediately available in all contrast examination areas.

EX Contrast Extravasation Management

Recognition

Swelling, pain, or redness at injection site during or after contrast administration. Power injectors increase risk with high-flow rates. Most common at antecubital fossa.

Immediate Management

STOP injection immediately Elevate limb above heart Apply cold compress (first 1–2h) Document volume extravasated Monitor for 2–4 hours

When to Escalate

!Escalate immediately if: blistering, skin blanching, altered sensation/perfusion, or >30 mL extravasation. Surgical consult may be required for compartment syndrome.

Documentation Required

Volume extravasated Site and appearance Time of onset Patient symptoms Clinician notified Follow-up plan

Contrast Safety Checker

Enter patient parameters to receive contrast safety risk assessment and pre-medication guidance. For clinical decision support only — always confirm with radiologist.

eGFR (mL/min/1.73m²)

Contrast Type Planned

Medications / Risk Factors (check all that apply)

Metformin / Glucophage

NSAIDs (ibuprofen, diclofenac)

Other nephrotoxic agents (aminoglycosides, cisplatin)

Currently on dialysis

Previous Contrast Allergy History

IR Interventional Radiology — Procedure Types

Vascular Procedures

Procedure	Indication
Diagnostic angiography	Vascular mapping, bleeding source
Angioplasty (PTA)	Arterial/venous stenosis dilation
Stenting	Maintain vessel patency post-PTA
Embolisation (HCC)	TACE/TARE for hepatocellular carcinoma
Embolisation (UAE)	Uterine fibroid embolisation
Embolisation (GI bleed)	Active GI haemorrhage
TIPSS	Portal hypertension, refractory ascites, variceal bleeding

Non-Vascular Procedures

Procedure	Indication
Percutaneous drainage	Abscess, effusion, biloma, ascites
Percutaneous biopsy	Liver, lung, renal, bone lesions
Nephrostomy	Ureteric obstruction
Biliary drainage (PTBD)	Biliary obstruction
PICC line insertion	Long-term IV access
Port-a-cath insertion	Chemotherapy, long-term access
RFA / Microwave ablation	Tumour ablation (liver, kidney, lung)

Px Pre-Procedure Nursing Preparation

Coagulation Requirements

Parameter	Threshold (most procedures)
INR	<1.5 (ideally <1.3 for biopsy)
Platelets	>50 × 10⁹/L
APTT	<1.5× control

⚠Anticoagulants: hold warfarin (bridge if needed), hold LMWH 12–24h pre-procedure, hold DOAC per drug half-life. Confirm with interventional radiologist.

Standard Pre-Procedure Checklist

Patient identity verified (2 identifiers) Consent obtained and signed NPO status confirmed (6h solid, 2h clear) IV access patent (18G minimum) Baseline vitals documented Coagulation results reviewed Allergy status confirmed Renal function checked Blood group & crossmatch if indicated

Medications Pre-IR

Medication	Action
Metformin	Hold if contrast used, eGFR <45
Warfarin	Hold 5 days; check INR day of procedure
Aspirin	Continue for most vascular procedures; hold for biopsy per protocol
Clopidogrel	Hold 5–7 days for high-bleed-risk procedures
Antibiotics	Prophylaxis per local protocol (e.g. cefazolin for drainage)

Patient Preparation

Sedation/analgesia plan: many IR procedures use conscious sedation (fentanyl + midazolam). Ensure oxygen, suction, and monitoring are available. Continuous SpO₂, ECG, NIBP monitoring during procedure.

AC Post-Procedure Access Site Care

Femoral Artery Access

Most common access site for major vascular procedures (groin, common femoral artery).

Manual compression 10–20 min post-sheath removal Closure device (Angioseal, Perclose) if used — different protocol Bed rest 2–4 hours post-procedure Keep leg extended during rest period

Monitoring (Femoral)

Pedal pulses (DP and PT) — 15min × 4, then hourly Haematoma formation check Limb temperature and colour BP monitoring (hypotension = retroperitoneal bleed risk)

!Urgent escalation if: expanding haematoma, loss of peripheral pulses, severe pain, hypotension — may indicate arterial injury or retroperitoneal haemorrhage.

Radial Artery Access

Increasingly preferred (lower complication rate, earlier ambulation). Used for upper limb and selected abdominal/visceral procedures.

TR Band (Terumo) or equivalent haemostasis device Inflate to haemostasis — gradually deflate over 2–3 hours Patent haemostasis technique: maintain palmar arch patency Ambulate immediately post-procedure

Monitoring (Radial)

SpO₂ on same hand continuously during band Hand warmth, colour, capillary refill Patient reports tingling/numbness (loosen band)

Ambulation Criteria (Femoral)

Haemostasis confirmed ≥2h Vitals stable Patient alert and orientated Peripheral pulses intact

A ALARA Principle & Cardinal Rules

ALARA

As Low As Reasonably Achievable — the guiding principle of radiation protection. All radiation exposure should be minimised to the lowest dose that still achieves the clinical objective, balancing benefit against risk.

Three Cardinal Principles

Principle	Action	Effect on Dose
⏱ Time	Minimise time near radiation source	Dose ∝ time
↔ Distance	Maximise distance from source	Dose ∝ 1/distance² (inverse square law)
🛡 Shielding	Use lead aprons, barriers, thyroid shield	Attenuates photon beam

ℹInverse square law: doubling your distance from a source reduces your dose to ¼. Moving from 0.5m to 2m reduces dose 16-fold.

Protective Equipment

Equipment	Specification	Coverage
Lead apron	0.25–0.5 mm Pb equivalent	Trunk, gonads
Thyroid shield	0.5 mm Pb equivalent	Thyroid gland
Lead glasses	0.75–1.0 mm Pb equivalent	Lens of eye
Lead gloves	0.5 mm Pb equivalent	Hands (fluoroscopy)
Leaded screen	1–2 mm Pb equivalent	Whole body barrier

⚠Lead aprons reduce trunk dose by ~90–95% for diagnostic X-ray energies but do NOT protect from high-energy sources. Annual inspection of lead aprons for cracks is required.

D Dosimetry & Occupational Dose Limits

Dosimetry Badge (TLD/OSL)

Thermoluminescent dosimeters (TLD) or optically stimulated luminescence (OSL) badges measure cumulative radiation dose. Worn at collar level outside lead apron (or at waist inside apron for whole-body estimate).

Read monthly or quarterly Report unusually high readings to Radiation Safety Officer Never share badges between staff Store away from radiation when not in use

Occupational Dose Limits (IAEA / FANR)

Category	Annual Limit
Whole body (effective dose)	20 mSv/year (5-year average, max 50 mSv any single year)
Lens of eye	20 mSv/year
Skin / extremities	500 mSv/year
Pregnant worker (embryo)	1 mSv for remainder of pregnancy after declaration

Pregnancy & Radiation

!Key policy: Pregnant staff must declare pregnancy to their Radiation Safety Officer/manager. Embryo dose limit is 1 mSv for the remainder of the pregnancy after declaration. Risk is highest in first trimester (organogenesis).

Declared pregnant workers should avoid fluoroscopy suites, interventional radiology, and nuclear medicine areas where possible, or wear additional shielding and have dose closely monitored.

Patient Shielding Principles

Gonadal shielding when gonads are in primary beam (paediatrics) Thyroid shield for neck/head procedures when feasible Collimation to minimise field size Justify every examination (clinical indication)

ℹModern practice: routine gonadal shielding is being reassigned in many centres — AAPM/RCR 2020 guidance notes it can obscure anatomy and increase repeat rates without significant dose reduction from modern detectors.

GCC GCC Radiation Regulatory Bodies

UAE — FANR

Federal Authority for Nuclear Regulation (FANR) regulates nuclear and radiation activities in the UAE. All staff working with ionising radiation require FANR-compliant training and registration. FANR sets dose limits aligned with IAEA BSS standards.

FANR licensing mandatory for radiation workers Annual dosimetry review Facility licence required for all X-ray equipment

Saudi Arabia — NRRC

Nuclear and Radiological Regulation and Control Authority (NRRC) (previously under KACST) oversees radiation safety, licensing, and regulatory compliance across KSA. Hospitals must register all radiation-emitting equipment.

NRRC licensing for radiation workers in KSA Radiation safety committee required in hospitals Dose monitoring programme mandatory

ℹOther GCC states (Qatar, Kuwait, Bahrain, Oman) operate under their national regulatory bodies but all align with IAEA Safety Standards Series. Always verify local regulations with your hospital's Radiation Safety Officer.

Radiation Dose Estimator

Select a procedure to see approximate effective dose and chest X-ray equivalent. Values are population averages and vary by scanner, protocol, and patient size.

Select Procedure

M MRI Zones & Access Control

Zone I

General Public Area

Corridors, waiting rooms. No magnetic hazard. Unrestricted access. MRI patients not yet screened.

Zone II

Transition / Reception

Patients screened here before entry. Supervised by MRI staff. Includes patient changing area.

Zone III

MR Control Room

Access controlled. Fringe field present. MRI-trained staff only. All personnel must be screened before entry.

Zone IV

MR Scanner Room

Active magnetic field always present (5 Gauss line boundary). Only fully screened individuals. All items must be MR-safe/conditional.

!Zone IV is always "live" — the magnetic field is not switched off between patients. Ferromagnetic objects become high-velocity projectiles (missile effect). Never bring unscreened equipment or persons into Zone IV.

SC Ferromagnetic Screening

Screening Process

Written MRI safety questionnaire (all patients + escorts) Verbal confirmation of responses Walk-through metal detector (Zone II/III boundary) Hand-held ferromagnetic detector wand if uncertain

Patient Questionnaire Covers

Cardiac devices (pacemaker/ICD/Loop recorder) Cochlear implants Intracranial aneurysm clips Intraocular metallic foreign body Spinal cord stimulators Insulin pump / drug infusion pump Orthopaedic implants Dental implants / braces Tattoos (ferromagnetic ink risk — rare) Transdermal patches (metallic foil — remove) Pregnancy

Absolute Contraindications (MRI Unsafe)

Do NOT proceed to MRI scan with:

Non-MR-safe pacemaker or implantable defibrillator (ICD)
Cochlear implant (most are MRI unsafe — verify model)
Intraocular metallic foreign body (history of metal work → orbital X-ray first)
Ferromagnetic intracranial aneurysm clips
Penile implant (some types)
Magnetically activated implant in critical location

Conditional Devices

MR-Conditional pacemakers (e.g., Medtronic Advisa MRI, St Jude Accent MRI): can be scanned under specific conditions — device must be programmed to "magnet/MRI mode" by cardiologist before scanning, and reprogrammed post-scan. Requires specific scanner field strength and SAR limits.

Implant Verification Resource

MRIsafety.com (Dr Frank Shellock) — primary reference Manufacturer implant documentation MagResource.com

EM MRI Emergency — Quench Procedure

What is a Quench?

A quench is the deliberate (or accidental) rapid venting of cryogen (liquid helium) from the superconducting magnet, causing the magnetic field to collapse rapidly. This allows removal of a trapped ferromagnetic object or person.

!Quench only in life-threatening emergencies — it is irreversible, costs hundreds of thousands of dollars to restore, and releases large volumes of cryogen gas (oxygen displacement risk).

Emergency Quench Protocol

Press QUENCH button (located in scanner room, marked red) Evacuate Zone IV and Zone III immediately Call emergency services + MRI physicist/engineer Do not re-enter until cryogen has vented and O₂ levels confirmed safe

Claustrophobia Management

Explain procedure clearly; show scanner beforehand Feet-first entry if possible Open MRI (wide-bore 1.5T or 3T) or low-field open magnet Anxiolytic: lorazepam 0.5–1mg PO or midazolam IV (with monitoring) Provide call button; reassure patient can stop anytime

GCC Radiology in the GCC Healthcare Landscape

High CT Utilisation in GCC EDs

GCC emergency departments have among the highest CT utilisation rates globally. Key drivers include:

Rapid access culture and patient expectation of advanced imaging Medico-legal defensive medicine practice High specialist-to-GP ratio driving direct referrals Expatriate workforce culture (short-stay patients seeking rapid diagnosis)

Contrast Nephropathy Burden

GCC populations have significantly elevated rates of diabetes mellitus (prevalence 15–25% across GCC states) and chronic kidney disease. This substantially increases the population risk for contrast-induced nephropathy.

⚠Nursing implication: eGFR checking before all contrast studies is particularly critical in GCC settings. Do not assume a patient is low-risk based on age alone.

PACS Systems in GCC Hospitals

Vendor	System	Presence in GCC
Agfa HealthCare	XERO / ORBIS	Widely deployed (UAE, KSA)
Fujifilm	Synapse PACS	Strong presence in GCC
Philips	IntelliSpace PACS	Multiple GCC hospital groups
Sectra	Sectra PACS	Growing GCC footprint
GE Healthcare	Centricity	Present in KSA, UAE

Teleradiology Services

Teleradiology is widely used across GCC for after-hours reporting and subspecialty reads (neuroradiology, MSK). Nurses should be aware that the reporting radiologist may be remote and escalation pathways may differ from on-site arrangements. Critical findings communication protocols remain essential.

REG GCC Regulatory & Accreditation Framework

UAE

FANR (Federal Authority for Nuclear Regulation): all radiation workers require FANR-recognised training and dosimetry registration. FANR issues licences to facilities and individuals. Abu Dhabi Healthcare Authority (HAAD/DOH) and Dubai Health Authority (DHA) set clinical standards independently within UAE.

Saudi Arabia

NRRC (Nuclear and Radiological Regulation and Control Authority) — supersedes the previous KACST radiation function. Ministry of Health (MOH) and CBAHI set hospital standards. CBAHI accreditation includes radiology-specific safety requirements.

Qatar, Kuwait, Bahrain, Oman

Each state has a national regulatory body aligned with IAEA standards. Qatar: QRA (Qatar Radiation Regulation Authority). Kuwait: PAAET/Ministry of Health radiation safety unit. Confirm local requirements with your RSO.

JCI Accreditation — Radiology Standards

Joint Commission International (JCI)-accredited hospitals across GCC must meet specific radiology standards including:

Radiology services available 24/7 Qualified radiologists oversee all diagnostic services Radiation protection programme documented Equipment QA/QC programme in place Critical results reporting policy (turnaround time) Contrast reaction management protocol MRI safety programme with written policies

Notable GCC Radiology Departments

Hospital	Location	Note
MGH Abu Dhabi (Cleveland Clinic)	Abu Dhabi, UAE	Advanced imaging, JCI accredited
King Faisal Specialist Hospital (KFSH&RC)	Riyadh, KSA	Regional tertiary referral centre
Aga Khan University Hospital	Karachi (regional)	Academic radiology training
Hamad Medical Corporation	Doha, Qatar	National tertiary imaging network
American Hospital Dubai	Dubai, UAE	JCI, advanced interventional

Q Practice MCQs — Radiology Nursing

Test your knowledge across all six modules. Click an answer to receive instant feedback.

0/10

Questions answered correctly

Question 1 — Imaging Modalities

A portable chest X-ray is performed in the ICU. The radiologist reports cardiomegaly. Which statement is most appropriate?

AP portable X-rays magnify the cardiac silhouette by 15–20% due to divergent beam geometry and short film distance. Cardiomegaly cannot be reliably diagnosed on AP films without correlation — a PA film or echocardiogram is required for definitive assessment.

Question 2 — CT Imaging

A CT abdomen shows a liver lesion with a Hounsfield unit value of −85. What tissue does this most likely represent?

Fat has Hounsfield units in the range of −80 to −120 HU. A lesion at −85 HU contains fat, which is characteristic of entities such as hepatic adenoma with fat, angiomyolipoma (renal/hepatic), lipoma, or liposarcoma. Water/cysts are near 0 HU; acute blood is +40–60 HU; calcification/bone is +400–1000+ HU.

Question 3 — Contrast Media

A patient with Type 2 diabetes is taking metformin 1000mg BD and has an eGFR of 38 mL/min/1.73m². IV iodinated contrast CT is planned. What is the MOST important nursing action?

eGFR 38 is in the high-risk zone for contrast-induced nephropathy (threshold <45 mL/min/1.73m²). Metformin must be held POST-contrast for 48 hours due to risk of lactic acidosis if AKI occurs (not pre-contrast). IV saline hydration (1 mL/kg/hr for 6–12h pre and post) is the most evidence-based preventive measure. Radiologist must be informed to consider risk/benefit and use minimum contrast volume with iso-osmolar agent.

Question 4 — MRI Safety

A patient reports having had a metalworking job 10 years ago and is now referred for brain MRI. No MRI implant card is available. What is the most appropriate action?

A history of metalworking raises the risk of intraocular metallic foreign bodies (IOFB). IOFBs can be asymptomatic. The magnetic field can cause the fragment to move, resulting in intraocular haemorrhage or blindness. The ACR MRI Safety Guidelines mandate bilateral orbital X-rays before proceeding in patients with a history of metalworking involving grinding or drilling in or near the eye. Symptoms alone are insufficient to exclude an IOFB.

Question 5 — Radiation Safety

A staff nurse is 8 weeks pregnant and regularly assists with portable X-rays on the ward. What is the recommended monthly embryo dose limit once pregnancy is declared?

IAEA BSS and FANR regulations set the limit at 1 mSv for the embryo/foetus for the remainder of the pregnancy after formal declaration — not 1 mSv per month. After declaration, the nurse should inform her Radiation Safety Officer and manager, and a risk assessment should be conducted. She may continue ward-based work with appropriate precautions and dose monitoring. Total restriction is not necessarily required but minimising unnecessary exposure is important, especially in the first trimester.

Question 6 — Interventional Radiology

Following a femoral artery puncture for angiography, a patient develops sudden onset severe pain in the groin with a rapidly expanding mass and blood pressure drops from 130/80 to 90/60 mmHg. What is the PRIORITY concern?

Expanding groin haematoma with haemodynamic instability after femoral artery access is a medical emergency. Retroperitoneal haemorrhage (bleeding tracking up behind the peritoneum from a high femoral puncture) or uncontrolled femoral haematoma can cause rapid exsanguination. Immediate actions: call for urgent medical assistance, apply firm manual pressure, establish large-bore IV access, prepare for fluid resuscitation and blood transfusion, urgent interventional radiology/vascular surgery review. This is not a vasovagal — the expanding mass and haemodynamic instability indicate active arterial haemorrhage.

Question 7 — Contrast Allergy

A patient develops widespread urticaria and facial flushing 3 minutes after IV iodinated contrast injection for CT. SpO₂ is 98%, BP 125/75, heart rate 88. What grade of reaction is this and what is the first-line treatment?

Urticaria and flushing with stable vital signs and normal SpO₂ constitute a mild contrast reaction. Treatment is antihistamine (H1 blocker) and observation for at least 30–60 minutes for progression. Adrenaline is reserved for severe reactions (anaphylaxis with airway compromise, bronchospasm, cardiovascular collapse). The patient should be monitored closely for progression to moderate/severe reaction. Document the reaction and notify the referring clinician — pre-medication will be required for all future contrast studies.

Question 8 — MRI Contrast

A patient with end-stage renal disease (eGFR 12 mL/min/1.73m², on haemodialysis) requires an MRI with gadolinium contrast. Which statement is correct?

Dialysis patients are at HIGHEST risk for NSF from gadolinium-based contrast agents — renal clearance of gadolinium is absent, leading to prolonged gadolinium circulation and deposition. Only macrocyclic agents (gadoterate/Dotarem, gadobutrol/Gadavist) — which have the highest thermodynamic and kinetic stability — should be considered, with a detailed risk/benefit discussion and documented consent. Dialysis should be arranged within 24 hours post-scan to remove gadolinium. Linear agents (gadodiamide/Omniscan, gadopentetate/Magnevist) are contraindicated in this group.

Question 9 — GCC Context

In the UAE, which regulatory body is responsible for licensing radiation workers and regulating ionising radiation use in healthcare facilities?

FANR (Federal Authority for Nuclear Regulation) is the UAE federal body responsible for regulating all nuclear and radiological activities, including licensing of radiation-emitting equipment and radiation workers. HAAD/DOH regulates healthcare quality standards. NRRC is the equivalent body in Saudi Arabia. The IAEA sets international standards but does not directly licence workers in individual countries — national bodies implement IAEA BSS standards locally.

Question 10 — Radiation Dose

A patient asks how much radiation they will receive from a CT chest/abdomen/pelvis scan compared to a standard chest X-ray. Which is the most accurate response?

A CT chest/abdomen/pelvis delivers approximately 10–12 mSv effective dose. A standard PA chest X-ray delivers approximately 0.02 mSv. This gives a ratio of approximately 500–600 chest X-ray equivalents. This is an important concept for nurses to communicate in radiation justification discussions. Despite this, the absolute lifetime cancer risk from a single CT CAP is estimated at <0.1%, and the clinical benefit in appropriate indications far exceeds this risk. However, unnecessary CT scanning — particularly common in GCC EDs — is a valid public health concern.