100+ Free ACVR Veterinary Radiology Practice Questions

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Historically ~40-70% first-time pass across components (ACVR annual statistics) Pass Rate

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Question 1

Score: 0/0

Increasing kVp on a radiograph primarily affects which image characteristic?

Image density only

Radiographic contrast (scale of gray)

Focal spot size

Source-image distance

to track

2026 Statistics

Key Facts: ACVR Veterinary Radiology Exam

100

Free Practice Questions

OpenExamPrep ACVR Veterinary Radiology question bank

Exam Components

Written + image identification + oral (ACVR Diagnostic Imaging)

~12%

Thoracic Weight

Largest single domain on 2026 ACVR blueprint (tied with MSK)

~$1,500-$2,500

2026 Exam Fees

ACVR (verify current schedule)

3-4 yr

Residency Length

ACVR-approved diagnostic imaging residency

~40-70%

First-Time Pass Rate

ACVR annual statistics (varies by component)

The ACVR Veterinary Radiology Certifying Exam (Diagnostic Imaging) is a multi-component exam from the American College of Veterinary Radiology comprising written multiple-choice, image identification (unknowns), and oral examinations. Content spans thoracic (~12%), MSK (~12%), abdominal radiography (~10%), abdominal US (~10%), cardiac (~8%), physics/safety (~8%), contrast/radiography basics (~8%), positioning (~8%), CT (~6%), MRI (~6%), US physics (~6%), equine (~4%), nuclear medicine (~3%), and radiation oncology (~2%). Exam fees total ~$1,500-$2,500; requires an ACVR-approved residency (3-4 years) plus a peer-reviewed publication.

Sample ACVR Veterinary Radiology Practice Questions

Try these sample questions to test your ACVR Veterinary Radiology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Increasing kVp on a radiograph primarily affects which image characteristic?

A.Image density only

B.Radiographic contrast (scale of gray)

C.Focal spot size

D.Source-image distance

Explanation: kVp controls the energy (penetration) of the x-ray beam and therefore the radiographic contrast — higher kVp yields a longer gray scale (lower contrast) by producing more penetrating photons and more Compton scatter. mAs primarily controls beam quantity (density).

2Per NCRP recommendations, what is the maximum annual occupational whole-body effective dose limit for a radiation worker?

A.5 mSv/year

B.15 mSv/year

C.50 mSv/year

D.150 mSv/year

Explanation: NCRP recommends an annual occupational whole-body effective dose limit of 50 mSv with a cumulative lifetime limit of 10 mSv × age. The lens of the eye limit is 150 mSv/year and extremities/skin are 500 mSv/year. Public dose limit is 1 mSv/year.

3The minimum lead-equivalent thickness required for protective aprons used in diagnostic radiography is:

A.0.25 mm Pb

B.0.5 mm Pb

C.1.0 mm Pb

D.2.0 mm Pb

Explanation: Standard protective aprons should provide a minimum of 0.5 mm lead equivalence at 100 kVp, attenuating approximately 90-95% of scatter. Thyroid shields and gonad shields should also be 0.5 mm Pb. Aprons should be inspected fluoroscopically or radiographically annually.

4Which personnel dosimetry badge type is most commonly used in modern veterinary radiology practice because it is reusable and accurate at low doses?

A.Film badge

B.Pocket ionization chamber

C.Optically stimulated luminescence (OSL)

D.Geiger-Müller counter

Explanation: OSL dosimeters (aluminum oxide) have largely replaced film and are preferred for their low minimum detectable dose (~10 μSv), reusability, resistance to heat/humidity, and long wear periods. TLDs (LiF) remain widely used; film badges are largely obsolete in North America.

5A radiographic grid is MOST beneficial for improving image contrast when imaging body parts thicker than:

A.4 cm

B.10 cm

C.20 cm

D.30 cm

Explanation: Grids are generally indicated for anatomy thicker than 10 cm because scatter radiation increases substantially beyond this thickness, degrading contrast. Grids absorb scatter but require increased mAs (Bucky factor 2-6×). Focused grids must be used at the correct focal distance to avoid grid cutoff.

6The acronym ALARA in radiation safety stands for:

A.As Long As Radiation Allows

B.Automated Linear Attenuation Radiographic Assessment

C.As Low As Reasonably Achievable

D.Absolute Limit of Applied Radiation Activity

Explanation: ALARA — As Low As Reasonably Achievable — is the governing principle of radiation protection, applied via the three cardinal rules: minimize time, maximize distance (inverse square law), and maximize shielding. Chemical restraint should be used in place of manual restraint whenever possible.

7If the distance from an x-ray source is doubled, the radiation intensity at the new distance is:

A.Doubled

B.Halved

C.One-quarter

D.Unchanged

Explanation: The inverse square law states that intensity is inversely proportional to the square of the distance: doubling distance reduces intensity to 1/4 (one-quarter). This is why maximizing distance from the primary beam and patient scatter is a cardinal principle of radiation protection.

8Which of the following interactions is the dominant source of scatter radiation at diagnostic kVp ranges?

A.Photoelectric effect

B.Compton scattering

C.Pair production

D.Coherent (Rayleigh) scattering

Explanation: At diagnostic kVp (50-150), Compton scattering dominates in soft tissue and is the principal source of scatter that degrades image contrast and creates personnel exposure hazard. The photoelectric effect is more energy- and Z-dependent and produces most subject contrast (bone/iodine/barium).

9For a left lateral thoracic radiograph in a dog, proper positioning requires:

A.Patient on left side, forelimbs pulled caudally, beam centered at the caudal tip of the scapula at peak expiration

B.Patient on left side, forelimbs pulled cranially, beam centered at the caudal tip of the scapula at peak inspiration

C.Patient in dorsal recumbency with beam centered at the xiphoid

D.Patient on right side, forelimbs extended caudally, beam at the 13th rib

Explanation: Lateral thorax: forelimbs extended cranially (to prevent triceps superimposition over the cranial thorax), beam centered at the caudal border of the scapula, exposure at peak inspiration to maximize lung aeration. Sternum and spine should be superimposed — rotation creates asymmetric rib heads.

10In a properly positioned ventrodorsal (VD) thoracic radiograph, what anatomic landmarks confirm the absence of rotation?

A.Sternebrae superimposed over the thoracic vertebrae with symmetric ribs

B.The cardiac silhouette completely centered left

C.The diaphragm appearing as a single dome

D.Overlap of the scapulae over the cranial lung lobes

Explanation: VD thorax: sternum superimposed over the spine, symmetric rib heads and costochondral junctions, and the spinous processes appearing end-on. Rotation moves the sternum off-center and creates asymmetric rib lengths, which can create artifactual lung opacity changes.

About the ACVR Veterinary Radiology Exam

The ACVR Veterinary Radiology Certifying Examination (Diagnostic Imaging) validates comprehensive expertise in small animal and equine diagnostic imaging. Content spans thoracic radiology (pulmonary patterns, CHF, VHS, VLAS), musculoskeletal radiology (aggressive vs non-aggressive bone lesions, elbow/hip dysplasia, OCD), abdominal radiography and ultrasound (serosal detail, GDV, linear FB, liver/spleen/adrenal US, gallbladder mucocele, portosystemic shunt), cardiac imaging (echocardiography, MMVD ACVIM staging, HCM), radiation physics and safety (ALARA, kVp/mAs, grids, dose limits), contrast studies (iohexol, VFSS, myelography), positioning and artifacts, CT (Hounsfield units, bone/lung/soft tissue windows, angiography), MRI (T1/T2/FLAIR/STIR/DWI/gadolinium), ultrasound physics (transducers, Doppler, artifacts), equine imaging (navicular, laminitis, tendons), nuclear medicine (99mTc bone scan, feline hyperthyroidism, I-131), and an overview of radiation oncology. Requires completion of an ACVR-approved diagnostic imaging residency (3-4 years) plus a peer-reviewed publication.

Questions

100 scored questions

Time Limit

Multi-day certifying exam (written + image ID + oral)

Passing Score

Criterion-referenced standard set by ACVR examination committee across written, image ID, and oral components

Exam Fee

~$1,500-$2,500 total exam fees (ACVR 2026 — verify current schedule) (American College of Veterinary Radiology (ACVR))

ACVR Veterinary Radiology Exam Content Outline

~12%

Thoracic Radiology

Pulmonary patterns (alveolar air bronchograms, interstitial structured/unstructured, bronchial donuts/tramlines, vascular), pneumonia vs cardiogenic edema vs hemorrhage, left-CHF distribution (perihilar/caudodorsal in dogs; variable/ventral in cats), pneumothorax (dorsal elevation of cardiac silhouette), pleural effusion (pleural fissure lines, rounded borders), mediastinal masses (thymoma, lymphoma), VHS (vertebral heart score — dog >10.5 abnormal), VLAS (vertebral left atrial size — MMVD staging), tracheal collapse, PDA/PS/AS/VSD radiographic signs.

~12%

Musculoskeletal Radiology

Aggressive vs non-aggressive bone lesions (periosteal reaction — smooth/solid benign vs sunburst/Codman triangle aggressive; zone of transition, cortical destruction, soft-tissue mass), osteosarcoma (metaphyseal; away from elbow, toward knee), panosteitis, hypertrophic osteodystrophy, elbow dysplasia components (FMCP, medial coronoid process; OCD humeral condyle; UAP; incongruity), hip dysplasia (PennHIP distraction index, OFA, Norberg angle), OCD shoulder/stifle/tarsus, cranial cruciate ligament rupture (joint effusion, caudal displacement), patellar luxation.

~10%

Abdominal Radiology

Loss of serosal detail (peritoneal effusion, carcinomatosis, young/emaciated patients), GDV (reverse-C/double-bubble/compartmentalization), mechanical vs functional ileus, linear foreign body (plication, teardrop gas), pneumoperitoneum, hepatomegaly/microhepatica, splenic masses, renal size (2.5-3.5× L2 length in cats), urolithiasis (radiopaque struvite/calcium oxalate vs lucent urate/cystine), prostatomegaly, uterine enlargement (pyometra), megacolon.

~10%

Abdominal Ultrasound

Liver echogenicity (iso-/hypo-/hyperechoic vs spleen and kidney cortex), gallbladder mucocele (kiwi fruit/stellate), portosystemic shunt (intra- vs extrahepatic; congenital single vs acquired multiple), spleen (nodular hyperplasia vs hemangiosarcoma — cavitated mass with hemoabdomen), adrenal gland size (normal <7.4 mm thickness; pheochromocytoma, cortisol-secreting tumors), kidney (pyelectasia, perinephric pseudocyst, FIP changes), GI layering and wall thickness, intussusception (target/pseudokidney), pancreas (hypoechoic/enlarged with pancreatitis), mesenteric lymph nodes, ascites, AFAST/TFAST protocol.

~8%

Cardiac Imaging

Echocardiography standard views (right parasternal long-axis 4-chamber, right parasternal short-axis at levels of LV/mitral/aorta, left apical 4-chamber), M-mode LV measurements (LVIDd, LVIDs, FS%, EF), LA:Ao ratio (>1.6 indicates LA enlargement), MMVD (myxomatous mitral valve disease) ACVIM staging B1/B2/C/D, HCM in cats (LV free wall/IVS >6 mm, SAM of mitral valve, dynamic LVOT obstruction, LA dilation), DCM in Dobermans and giant breeds, pericardial effusion and cardiac tamponade, PDA (continuous ductal flow), pulmonic and aortic stenosis Doppler gradients (peak velocity/gradient = 4v²).

~8%

Radiation Physics & Safety

X-ray production (bremsstrahlung + characteristic), kVp controls penetration/contrast, mAs controls quantity, heel effect, grids (ratio, frequency, cutoff), scatter/SID relationships, CR vs DR detectors, dose units (absorbed — Gy, equivalent — Sv, effective), ALARA principles (time, distance, shielding — inverse square law), occupational dose limits (50 mSv/year effective dose), film badge/OSL dosimetry, 0.5 mm Pb-equivalent apron/thyroid shield/gloves, fluoroscopy dose awareness and operator positioning.

~8%

Contrast Studies & Radiography Basics

Positive contrast — iodinated nonionic low-osmolar IV contrast (iohexol, iopamidol); barium sulfate (not for perforation), iodinated oral contrast when perforation suspected; negative contrast (air/CO2); myelography (iohexol 240-300 mgI/mL intrathecal lumbar/cisternal); cystography (pneumo-, positive-, double-contrast); excretory urography/IVU; esophagography and upper GI series; VFSS (videofluoroscopic swallow study) for dysphagia; recognition and management of contrast extravasation and adverse reactions; fundamentals of radiographic technique and image optimization.

~8%

Positioning, Artifacts & Technique

Standard projections (VD, DV, lateral L/R; oblique views; skyline patellar; open-mouth TMJ/tympanic; rostrocaudal skull), elbow positioning (flexed lateral, extended lateral, craniocaudal) for FMCP/UAP/OCD, hip positioning (OFA ventrodorsal extended-leg, PennHIP distraction), digital radiography artifacts (ghosting, Moiré pattern, uberschwinger/overshoot at edges), grid cutoff, motion blur, quantum mottle/noise, scatter, double exposure, processing and collimation errors.

~6%

CT (Computed Tomography)

CT physics (Hounsfield units — water 0, air -1000, fat -100, soft tissue 40-80, bone 400-1000), window/level settings (bone W2000/L500, lung W1500/L-600, soft tissue W400/L40, brain W80/L40), multidetector CT and pitch, helical/spiral acquisition, IV contrast phases (arterial, portal venous, delayed), CT angiography for portosystemic shunt and thromboembolic disease, CT staging of thoracic/abdominal neoplasia (pulmonary mets), nasal/sinus/temporal bone CT, common artifacts (metal streak, beam hardening, partial volume, motion).

~6%

MRI (Magnetic Resonance Imaging)

T1-weighted (fat bright, water dark; anatomy), T2-weighted (water/CSF bright, edema bright; pathology), FLAIR (fluid suppression — CSF dark, edema remains bright), STIR (fat suppression), DWI/ADC (cytotoxic edema — stroke, abscess), gradient echo (blooming for hemosiderin/blood products), gadolinium contrast enhancement patterns (meningioma — homogeneous with dural tail; glioma — heterogeneous/ring; disc extrusion — peripheral rim), MRI safety and ferromagnetic contraindications, intracranial neoplasia, intervertebral disc disease (Hansen Type I extrusion vs Type II protrusion), myelopathy, spinal cord lesions.

~6%

Ultrasound Physics

Piezoelectric crystal transducers, frequency-resolution-penetration tradeoff (higher MHz = better resolution, less depth), linear vs curvilinear vs phased-array transducers, B-mode, M-mode, Doppler modes (color, power, pulsed-wave, continuous-wave), aliasing and Nyquist limit, spectral Doppler angle correction (<60°), artifacts (reverberation, comet tail, ring-down, acoustic shadowing, distal acoustic enhancement, mirror image, refraction/edge shadowing, side lobe), focal zone placement and time-gain compensation.

~4%

Equine Imaging

Equine foot radiography standard 4-view series (lateromedial, dorsopalmar/D60P, D65PPaD upright pedal, palmaroproximal-palmarodistal oblique/skyline navicular), navicular syndrome (synovial invaginations/lucencies along flexor cortex, enthesiophytes), laminitis and distal phalanx rotation/sinking, osteochondral fragments (fetlock, carpus, tarsus), stress/condylar fractures, suspensory ligament injury on ultrasound, tendon injuries (SDFT core lesion, DDFT), nuclear scintigraphy for occult lameness.

~3%

Nuclear Medicine & Molecular Imaging

Technetium-99m (t½ 6 hr, 140 keV gamma) radiopharmaceuticals; bone scintigraphy (99mTc-MDP/HDP) for equine lameness localization and occult fractures; 99mTc-pertechnetate thyroid scintigraphy — gold standard for feline hyperthyroidism, providing thyroid:salivary uptake ratio and detection of ectopic/mediastinal functional tissue and distinguishing benign adenomatous hyperplasia from carcinoma; I-131 therapy for feline hyperthyroidism; portosystemic shunt scintigraphy (per-rectal 99mTc-pertechnetate); 99mTc-DTPA for glomerular filtration rate; radiation safety for the radioactive patient.

~2%

Radiation Oncology (Overview)

Basic principles relevant to the diagnostic imaging subspecialty: linear accelerators vs cobalt-60 sources, external beam radiation therapy, stereotactic radiosurgery/radiotherapy (SRS/SRT), intensity-modulated radiation therapy (IMRT), definitive vs palliative fractionation schedules, common tumors treated (canine nasal adenocarcinoma, brain tumors, oral melanoma/SCC, soft tissue sarcoma), acute vs late radiation side effects and VRTOG scoring, target volume delineation (GTV — gross tumor volume, CTV — clinical target volume, PTV — planning target volume).

How to Pass the ACVR Veterinary Radiology Exam

What You Need to Know

Passing score: Criterion-referenced standard set by ACVR examination committee across written, image ID, and oral components
Exam length: 100 questions
Time limit: Multi-day certifying exam (written + image ID + oral)
Exam fee: ~$1,500-$2,500 total exam fees (ACVR 2026 — verify current schedule)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ACVR Veterinary Radiology Study Tips from Top Performers

1VHS (vertebral heart score) — measure cardiac long and short axes on the lateral thoracic radiograph, sum and express in vertebral body units starting at T4. Canine reference >10.5 generally abnormal (breed variation — Boxers/Labs tolerate up to ~11). VLAS (vertebral left atrial size) on the right lateral (caudal border of LA to ventral edge of T4) helps stage MMVD per ACVIM guidelines: B2 stage typically VLAS >3.0 and LA:Ao >1.6 with LV dilation, triggering pimobendan.

2CT Hounsfield windows — memorize bone (W 2000 / L 500), lung (W 1500 / L -600), soft tissue/abdomen (W 400 / L 40), and brain (W 80 / L 40). Density reference: air -1000, fat -100, water 0, soft tissue +40-80, acute hemorrhage +60-80, calcification/bone +400-1000. Use dual-phase (arterial + portal venous) for liver, pancreas, and portosystemic shunt studies; delayed phase for urinary tract.

3MRI sequence cheat sheet — T1: fat bright, CSF/water dark (anatomy); T2: water/CSF/edema bright (pathology); FLAIR: CSF suppressed, edema stays bright (periventricular lesions); STIR: fat suppressed (marrow edema, vascular anomalies); DWI/ADC: restricted diffusion in acute infarct and pyogenic abscess; GRE: blooming from hemosiderin/blood. Post-gadolinium patterns: meningioma — homogeneous with dural tail; glioma — heterogeneous/ring; acute disc extrusion — peripheral rim enhancement.

4ALARA radiation safety — occupational effective dose limit 50 mSv/year (annual) and 100 mSv over 5 consecutive years. Inverse square law: doubling distance reduces dose to 1/4. Shielding in order of effectiveness: shielding > distance > time. Standard PPE: 0.5 mm Pb-equivalent lead apron, thyroid shield, gloves, and leaded glasses for fluoroscopy. Always wear your film badge/OSL dosimeter outside the apron at collar level for whole-body monitoring.

599mTc-pertechnetate thyroid scintigraphy is the gold standard for feline hyperthyroidism — not only confirms the diagnosis but also localizes ectopic/mediastinal thyroid tissue (~15-20% of cases) and evaluates bilateral vs unilateral disease, critical for surgical planning. Thyroid:salivary uptake ratio >1 is diagnostic (normal ~1). Marked uptake with irregular margins, multifocal hot spots, or distant metastases raises concern for thyroid carcinoma (~1-3% of feline hyperthyroid cases) and favors I-131 over surgery.

Frequently Asked Questions

What is the ACVR Veterinary Radiology Certifying Examination?

The ACVR Veterinary Radiology Certifying Examination is the Diplomate credentialing examination administered by the American College of Veterinary Radiology. It validates comprehensive expertise in small animal and equine diagnostic imaging — radiography, ultrasound, CT, MRI, and nuclear medicine. The Diagnostic Imaging track is one of two ACVR subspecialty pathways (the other is Radiation Oncology). The exam comprises written multiple-choice, image identification (unknowns), and oral examination components, and candidates must pass all components to be awarded Diplomate status.

Who is eligible to take the ACVR Certifying Exam?

Candidates must hold a DVM/VMD (or equivalent) and complete an ACVR-approved diagnostic imaging residency — typically 3 to 4 years under ACVR Diplomate mentorship — with a documented case log. ACVR also requires a peer-reviewed first-author publication in an approved journal prior to sitting the exam (verify the current publication policy on the ACVR website). The program director must attest to satisfactory residency completion.

What is the format of the ACVR exam?

The ACVR Diagnostic Imaging Certifying Exam is a multi-day, multi-component examination: (1) written multiple-choice covering physics, safety, technique, and interpretation fundamentals; (2) image identification / unknowns testing rapid pattern recognition across radiography, ultrasound, CT, MRI, and nuclear medicine; and (3) an oral examination assessing structured clinical reasoning with diplomate examiners. Candidates must pass each component independently.

How much does the 2026 ACVR exam cost?

Total 2026 ACVR Certifying Examination fees across components are approximately $1,500 to $2,500 — always verify the current schedule on the ACVR website. Fees typically include a per-component registration, and retakes require re-registration for only the failed component(s). Candidates also pay ACVR annual membership dues and Maintenance of Certification fees after achieving Diplomate status.

When is the 2026 exam administered?

The ACVR Certifying Examination is typically administered once annually. Applications open several months in advance with deadlines for residency completion documentation, publication verification, and fee payment. Exact 2026 dates, application windows, and site information are announced on the ACVR examinations page. Candidates should plan their final residency year around the annual exam cycle.

How is the exam scored?

ACVR uses criterion-referenced passing standards set by the examination committee for each component. Scoring is component-based — written, image identification, and oral are each scored and passed independently. A candidate must pass all three components (within the allowed attempts and eligibility window) to be awarded Diplomate status. Score reports typically include component-level feedback to guide remediation for retake candidates.

What are the highest-yield topics?

Highest-yield topics include pulmonary pattern recognition and CHF distribution, VHS and VLAS measurements, MMVD ACVIM staging and HCM echo criteria, aggressive vs non-aggressive bone lesions, elbow and hip dysplasia components (FMCP, UAP, PennHIP, Norberg), GDV and linear foreign body recognition, gallbladder mucocele and portosystemic shunt ultrasound, Hounsfield unit windows (bone/lung/soft tissue/brain), MRI pulse sequence behavior (T1/T2/FLAIR/STIR/DWI), gadolinium enhancement patterns, ultrasound artifacts, ALARA and dose limits, 99mTc-pertechnetate for feline hyperthyroidism, and equine navicular imaging.

How should I study for this exam?

Plan 12 to 24 months of focused review layered on your final residency year. Map to the ACVR content outline: begin with physics, safety, and technique; then thoracic, cardiac, and abdominal radiography; abdominal ultrasound and cross-sectional (CT/MRI); MSK; equine; nuclear medicine; and a radiation oncology overview. Use Thrall's Textbook of Veterinary Diagnostic Radiology, Penninck's Atlas of Small Animal Ultrasonography, Butler's equine imaging, and the ACVR approved reading list. Drill image identification daily with unknown film sets. Complete 2-3 timed full-length mock exams and structured oral practice with diplomate mentors.