100+ Free NMTCB PET Practice Questions

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Question 1

Score: 0/0

What is the energy of annihilation photons detected in PET imaging?

140 keV

364 keV

511 keV

662 keV

to track

2026 Statistics

Key Facts: NMTCB PET Exam

225

Total Questions

200 scored + 25 pretest

3.75 hrs

Exam Time

NMTCB PET exam page

$225

Exam Fee

NMTCB fee schedule

7 yrs

Credential Validity

42 CE hours for renewal

35%

Procedures Domain

Content outline (heaviest)

700 hrs

Required Experience (NMT)

NMTCB eligibility

The NMTCB PET exam uses 225 questions (200 scored + 25 pretest) with a 3.75-hour time limit and $225 fee. Content weighting: Diagnostic Procedures (35%), Instrumentation/QC (30%), Radiopharmaceuticals (25%), Radiation Protection (10%). Administered year-round at IQT testing centers. NMTs need 700 hours PET experience; RTs need 1,000 hours + 100 competencies + 70 didactic hours. Credential valid 7 years.

Sample NMTCB PET Practice Questions

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

1What is the energy of annihilation photons detected in PET imaging?

A.140 keV

B.364 keV

C.511 keV

D.662 keV

Explanation: In PET imaging, a positron emitted from a radiotracer travels a short distance and annihilates with an electron, producing two 511 keV photons that travel in approximately opposite directions (180 degrees apart). These photon pairs are detected in coincidence by the ring detectors of the PET scanner.

2What is the half-life of F-18 fluorodeoxyglucose (FDG)?

A.20 minutes

B.68 minutes

C.110 minutes

D.6 hours

Explanation: F-18 has a physical half-life of approximately 110 minutes (about 2 hours). This relatively long half-life for a positron emitter allows for commercial production and distribution from regional cyclotrons to imaging centers that do not have on-site cyclotrons.

3What type of coincidence event occurs when two unrelated annihilation photons from different positron decays are detected simultaneously?

A.True coincidence

B.Scatter coincidence

C.Random coincidence

D.Prompt coincidence

Explanation: A random (or accidental) coincidence occurs when two photons from two separate annihilation events are detected within the coincidence timing window, creating a false line of response. Random coincidences increase with higher activity levels and wider coincidence windows, degrading image quality by adding background noise.

4Prior to an F-18 FDG PET scan, patients are typically instructed to fast for how long?

A.1-2 hours

B.4-6 hours

C.8-12 hours

D.24 hours

Explanation: Patients are instructed to fast for 4-6 hours before FDG PET imaging to lower serum insulin levels and blood glucose, which maximizes FDG uptake into metabolically active tissues such as tumors. Eating before the exam elevates insulin, which drives glucose (and FDG) into skeletal muscle, reducing tumor-to-background contrast.

5Which scintillation crystal is most commonly used in modern PET scanners due to its high light output and fast decay time?

A.Bismuth germanate (BGO)

B.Sodium iodide (NaI)

C.Lutetium oxyorthosilicate (LSO)

D.Cesium iodide (CsI)

Explanation: Lutetium oxyorthosilicate (LSO) and its derivative LYSO are the most commonly used crystals in modern PET scanners. They offer a fast scintillation decay time (~40 ns), high light output, and high stopping power for 511 keV photons. These properties enable time-of-flight PET capability and improved count rate performance.

6What is the primary advantage of time-of-flight (TOF) PET technology?

A.It eliminates the need for attenuation correction

B.It reduces patient radiation dose by 50%

C.It improves the signal-to-noise ratio of the reconstructed image

D.It removes random coincidence events entirely

Explanation: Time-of-flight PET measures the difference in arrival times of the two annihilation photons to localize the annihilation event along the line of response with greater precision. This additional information improves the signal-to-noise ratio (SNR), which is particularly beneficial for large patients and allows for shorter scan times or reduced injected activity.

7Rb-82 chloride is produced by which method?

A.Cyclotron irradiation of O-18 water

B.Sr-82/Rb-82 generator

C.Nuclear reactor fission

D.Cyclotron irradiation of Zn-68

Explanation: Rb-82 chloride is produced from a strontium-82/rubidium-82 (Sr-82/Rb-82) generator system. The parent isotope Sr-82 (half-life ~25 days) is loaded onto a column and decays to Rb-82, which is eluted with normal saline and administered intravenously for myocardial perfusion PET imaging.

8What is the half-life of Rb-82?

A.10 seconds

B.76 seconds

C.10 minutes

D.68 minutes

Explanation: Rb-82 has an ultra-short half-life of approximately 76 seconds (about 1.3 minutes). This short half-life allows for rapid serial imaging, such as rest and stress myocardial perfusion studies within a single session, while delivering a relatively low radiation dose to the patient.

9What is the recommended maximum blood glucose level for a patient undergoing an FDG PET scan?

A.100 mg/dL

B.150 mg/dL

C.200 mg/dL

D.300 mg/dL

Explanation: Most guidelines recommend that the patient's blood glucose level should be below 200 mg/dL before administering FDG. Elevated blood glucose competes with FDG for cellular uptake via GLUT transporters, reducing tumor uptake and increasing background activity, which can lead to false-negative results.

10In PET/CT, what is the primary purpose of the CT component?

A.To provide attenuation correction and anatomical localization

B.To replace the PET emission scan entirely

C.To perform radiation therapy planning only

D.To measure blood flow independently of PET

Explanation: The CT component in PET/CT serves two primary functions: providing attenuation correction for the PET emission data and supplying anatomical localization to correlate functional PET findings with precise anatomical structures. CT-based attenuation correction is faster and less noisy than traditional transmission scanning with external rod sources.

About the NMTCB PET Exam

The NMTCB PET credential certifies nuclear medicine technologists in positron emission tomography. The exam covers diagnostic procedures including oncology, cardiology, and neurology PET/CT (35%), PET instrumentation and quality control (30%), PET radiopharmaceuticals including FDG, Rb-82, Ga-68 DOTATATE, and PSMA agents (25%), and radiation protection (10%). This is a post-primary specialty requiring active CNMT/ARRT(N) and 700+ hours of PET clinical experience.

Questions

225 scored questions

Time Limit

3 hours 45 minutes

Passing Score

Criterion-referenced (not publicly disclosed)

Exam Fee

$225 (NMTCB)

NMTCB PET Exam Content Outline

35%

Diagnostic Procedures

PET/CT and PET/MR imaging, oncology/cardiology/neurology applications, acquisition parameters, image reconstruction, SUV, artifacts

30%

Instrumentation and Quality Control

PET detector systems, scintillation crystals (LSO/LYSO/BGO), coincidence detection, time-of-flight, dose calibrators, scanner QA, phantom testing

25%

Radiopharmaceuticals

F-18 FDG, Rb-82, N-13 ammonia, Ga-68 DOTATATE, Ga-68 PSMA, F-18 amyloid/tau agents, preparation, QC, cyclotron, generator systems

10%

Radiation Protection

Personnel monitoring, patient dose reduction, shielding, regulatory compliance, waste disposal

How to Pass the NMTCB PET Exam

What You Need to Know

Passing score: Criterion-referenced (not publicly disclosed)
Exam length: 225 questions
Time limit: 3 hours 45 minutes
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

NMTCB PET Study Tips from Top Performers

1Diagnostic Procedures is 35% — master FDG oncology protocols, cardiac PET perfusion (Rb-82, N-13), and neurology PET (amyloid, tau)

2Know PET detector physics: 511 keV annihilation photons, coincidence detection, LSO vs BGO crystal properties, time-of-flight benefit

3Master PET radiopharmaceuticals: F-18 FDG (110 min half-life, fasting 4-6 hr, glucose <200), Rb-82 (76 sec, generator), Ga-68 (68 min, generator)

4Understand SUV calculation and factors affecting it: body weight, uptake time, blood glucose, reconstruction method

Frequently Asked Questions

How many questions are on the NMTCB PET exam?

225 total questions: 200 scored and 25 unscored pretest items. You have 3 hours 45 minutes. Results are available immediately at the test center.

What are the prerequisites?

NMTs: active CNMT/ARRT(N)/CAMRT + 700 hours PET clinical experience. RTs: active ARRT(R/T) + CT/MRI credential + 1,000 hours + 100 competencies + 70 didactic hours.

How long is PET certification valid?

7 years. Recertify via re-examination or 42 hours of PET-specific CE (6 hours/year average).