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Which radiopharmaceutical is most commonly used for SPECT myocardial perfusion imaging?

Tl-201 thallous chloride

Tc-99m sestamibi

F-18 FDG

Rb-82 chloride

to track

2026 Statistics

Key Facts: NCT Exam

150

Total Questions

100 scored + 50 pretest

3 hrs

Exam Time

NMTCB NCT exam page

$225

Exam Fee

NMTCB fee schedule

401

Active Certificants

NMTCB (current)

50%

Procedures Domain

Content outline (heaviest)

700 hrs

Required Experience

NMTCB eligibility

The NMTCB NCT exam uses 150 questions (100 scored + 50 pretest) with a 3-hour time limit and $225 fee. Content weighting: Procedures (50%), Radiopharmaceuticals (15%), Stress Testing (15%), Anatomy/Physiology/Pathology (10%), Patient Care (10%). Administered year-round at IQT testing centers. Requires active CNMT/ARRT(N) + 700 hours nuclear cardiology experience. Credential valid 7 years. 401 active certificants.

Sample NCT Practice Questions

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

1Which radiopharmaceutical is most commonly used for SPECT myocardial perfusion imaging?

A.Tl-201 thallous chloride

B.Tc-99m sestamibi

C.F-18 FDG

D.Rb-82 chloride

Explanation: Tc-99m sestamibi is the most commonly used radiopharmaceutical for SPECT myocardial perfusion imaging due to its favorable 140 keV photon energy, 6-hour half-life, and minimal redistribution. Tl-201 was historically used but has been largely replaced due to its lower energy (69-83 keV) and higher radiation dose. F-18 FDG and Rb-82 are PET agents.

2During a Bruce protocol exercise stress test, each stage lasts how many minutes?

A.1 minute

B.2 minutes

C.3 minutes

D.5 minutes

Explanation: The Bruce protocol is the most commonly used treadmill exercise protocol in nuclear cardiology. Each stage lasts 3 minutes, with progressive increases in both speed and grade. Stage 1 begins at 1.7 mph and 10% grade, and each subsequent stage increases both parameters.

3What is the normal range for left ventricular ejection fraction (LVEF)?

A.30-45%

B.40-55%

C.55-70%

D.70-85%

Explanation: The normal LVEF is 55-70%. An LVEF below 55% is generally considered reduced and may indicate systolic dysfunction. Values below 40% indicate moderate to severe systolic dysfunction and are associated with increased risk of heart failure and cardiac events.

4Which coronary artery supplies the majority of the left ventricular myocardium including the anterior wall and septum?

A.Right coronary artery

B.Left circumflex artery

C.Left anterior descending artery

D.Posterior descending artery

Explanation: The left anterior descending (LAD) artery supplies the anterior wall, anterior septum, and apex of the left ventricle. It is the largest coronary artery and supplies the greatest proportion of myocardium. A significant LAD stenosis is often called a 'widow maker' due to the large territory at risk.

5What is the mechanism of action of regadenoson in pharmacologic stress testing?

A.Beta-1 adrenergic receptor agonist

B.Selective adenosine A2A receptor agonist

C.Phosphodiesterase inhibitor

D.Non-selective adenosine receptor agonist

Explanation: Regadenoson is a selective adenosine A2A receptor agonist that causes coronary vasodilation. Its selectivity for the A2A receptor reduces side effects compared to non-selective adenosine, which also activates A1 (heart block), A2B (bronchoconstriction), and A3 receptors. It is administered as a single fixed-dose IV bolus of 0.4 mg.

6In a rest-stress Tc-99m sestamibi protocol, what is the typical rest dose and stress dose?

A.5 mCi rest / 10 mCi stress

B.8-12 mCi rest / 24-36 mCi stress

C.20 mCi rest / 20 mCi stress

D.15 mCi rest / 15 mCi stress

Explanation: In a same-day rest-stress protocol with Tc-99m sestamibi, the rest dose is typically 8-12 mCi and the stress dose is 24-36 mCi (approximately 3:1 ratio). The higher stress dose is needed to overcome residual activity from the rest injection and ensure adequate count statistics for the stress images.

7Which radiopharmaceutical demonstrates redistribution and is used for viability assessment?

A.Tc-99m sestamibi

B.Tc-99m tetrofosmin

C.Tl-201 thallous chloride

D.Tc-99m pyrophosphate

Explanation: Tl-201 demonstrates redistribution, meaning it initially distributes based on blood flow but then redistributes over time based on cell membrane integrity and the sodium-potassium ATPase pump. Viable myocardium that appears as a defect on initial images may 'fill in' on delayed redistribution images at 3-4 hours. This property makes Tl-201 useful for viability assessment.

8What is the primary purpose of a MUGA (multigated acquisition) scan?

A.Assess myocardial perfusion

B.Determine left ventricular ejection fraction

C.Evaluate coronary artery patency

D.Detect myocardial infarction

Explanation: The MUGA scan, also called equilibrium radionuclide angiography (ERNA), is primarily performed to accurately and reproducibly measure left ventricular ejection fraction (LVEF). It uses Tc-99m labeled red blood cells and ECG gating to create a cine loop of the cardiac cycle. It is particularly valuable for serial monitoring of LVEF in patients receiving cardiotoxic chemotherapy.

9Which isotope is used in a generator system for cardiac PET perfusion imaging and has a half-life of approximately 76 seconds?

A.F-18

B.N-13

C.Rb-82

D.O-15

Explanation: Rb-82 (rubidium-82) has a half-life of approximately 76 seconds and is produced by a Sr-82/Rb-82 generator system. This generator-based production allows cardiac PET perfusion imaging without an on-site cyclotron. The ultra-short half-life enables rapid serial imaging and low radiation dose to patients.

10During exercise stress testing, which of the following is an absolute indication to terminate the test?

A.Mild chest discomfort

B.Achieving 85% of maximum predicted heart rate

C.Sustained ventricular tachycardia

D.ST depression of 1.0 mm

Explanation: Sustained ventricular tachycardia is an absolute indication to stop exercise stress testing immediately due to the risk of hemodynamic collapse and cardiac arrest. Other absolute endpoints include a drop in systolic blood pressure greater than 10 mmHg despite increasing workload, signs of poor perfusion, and the patient's request to stop.

About the NCT Exam

The NCT credential certifies nuclear medicine technologists in nuclear cardiology imaging. The exam covers procedures including myocardial perfusion SPECT/PET, MUGA, cardiac amyloidosis, and cardiac sarcoidosis imaging (50%), stress testing including exercise and pharmacologic protocols (15%), cardiac radiopharmaceuticals (15%), cardiac anatomy, physiology, and pathology (10%), and patient care including emergency response (10%).

Questions

150 scored questions

Time Limit

3 hours

Passing Score

Criterion-referenced (not publicly disclosed)

Exam Fee

$225 (NMTCB)

NCT Exam Content Outline

50%

Procedures

Myocardial perfusion SPECT/PET, MUGA/ERNA, first-pass studies, cardiac amyloidosis (PYP), cardiac sarcoidosis, MIBG, acquisition and processing

15%

Radiopharmaceuticals

Tc-99m sestamibi/tetrofosmin, Tl-201, Tc-99m PYP, I-123 MIBG, F-18 FDG, N-13 ammonia, Rb-82, preparation and QC

15%

Stress Testing

Exercise protocols (Bruce), pharmacologic stress (regadenoson, adenosine, dipyridamole, dobutamine), ECG interpretation, contraindications, endpoints

10%

Anatomy/Physiology/Pathology

Cardiac anatomy, coronary arteries, ejection fraction, CAD, cardiomyopathy, ischemia, infarction, hibernating myocardium

10%

Patient Care

Patient education, emergency care (ACLS), contrast reactions, diabetic complications, radiation safety, dose reduction

How to Pass the NCT Exam

What You Need to Know

Passing score: Criterion-referenced (not publicly disclosed)
Exam length: 150 questions
Time limit: 3 hours
Exam fee: $225

Keys to Passing

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

NCT Study Tips from Top Performers

1Procedures is 50% — master myocardial perfusion SPECT protocols (rest/stress, 1-day vs 2-day), gating, and image processing/interpretation

2Know stress testing protocols: Bruce treadmill protocol stages, regadenoson (single 0.4mg dose), and contraindications to each

3Understand cardiac radiopharmaceuticals: sestamibi vs tetrofosmin (both Tc-99m, no redistribution) vs Tl-201 (redistribution)

4Study newer applications: Tc-99m PYP for cardiac amyloidosis (ATTR), I-123 MIBG heart-to-mediastinum ratio for heart failure

Frequently Asked Questions

How many questions are on the NCT exam?

150 total: 100 scored and 50 unscored pretest items. You have 3 hours. 4-option multiple choice.

What are the prerequisites?

Active CNMT, ARRT(N), or CAMRT nuclear medicine credential plus 700 hours of documented nuclear cardiology clinical experience under board-certified physician supervision.

How long is NCT certification valid?

7 years. Recertify via re-examination or 42 hours of NCT-specific CE.