Radiation Physics + Detection
7%of exam
Radioactive MaterialsDecayPhoton InteractionsCounting StatisticsDetectors
Radiation Safety + Regulations
13%of exam
Pharmaceutical + Radiopharmaceutical Agents
25%of exam
Instrument Operations + QC
15%of exam
Dose CalibratorGamma CameraSPECTPETArtifacts
Clinical Procedures
40%of exam
Patient ScreeningProcedure SelectionAcquisitionImage QualityPatient Education
Quick Facts
- Credential
- Certified Nuclear Medicine Technologist
- Owner
- NMTCB
- Exam type
- Classification CAT
- Items
- 90 total items
- Time
- 1 hour 55 minutes
- Format
- Four-to-five option MCQ
- Passing score
- 375 scaled score
- Scale
- 200 to 500
- Unscored items
- Seamlessly included
- Navigation
- No skip or return
Compton vs Photoelectric
Compton
- Photon deflection
- Scatter contribution
Photoelectric
- Photon absorption
- Energy transfer
Scatter vs absorption
Physics Foundations
- Isotope
- Element nuclear variant
- Half-life
- Time for half decay
- Gamma emitter
- Emits gamma photon
- Beta emitter
- Emits beta particle
- Alpha emitter
- Emits alpha particle
- Positron emitter
- Emits positron
- Counting statistics
- Quantify count variation
Detection + Interactions
- Compton scatter
- Photon deflection interaction
- Photoelectric effect
- Photon absorption interaction
- NaI well
- Scintillation detector
- Ion chamber
- Gas ionization detector
- Solid-state detector
- Semiconductor radiation detector
- GM meter
- Gas survey detector
- Energy spectrum
- Detected energy distribution
ALARA
Time, distance, shielding reduce exposure
Shorter timeMore distanceProper shielding
Deterministic vs Stochastic
Deterministic
- Threshold-related
- Tissue effect
Stochastic
- Probability-related
- Cancer risk
Threshold effect vs probability
Safety + Protection
- ALARA
- Minimize practical exposure
- Time
- Reduce exposure duration
- Distance
- Increase source separation
- Shielding
- Attenuate radiation
- Deterministic effect
- Threshold-related tissue effect
- Stochastic effect
- Probability-based effect
- Radiosensitivity
- Cell response to radiation
Regulatory Controls
- Area survey
- Monitor radiation area
- Personal monitor
- Track worker exposure
- Restricted area
- Controlled radiation access
- NRC
- Nuclear regulatory authority
- Radioactive waste
- Controlled waste handling
- Written directive
- Required therapy authorization
- HIPAA
- Protect patient privacy
Radiochemical vs Radionuclidic Purity
Radiochemical
- Desired chemical form
- Kit quality control
Radionuclidic
- Correct radionuclide
- Generator breakthrough
Chemical form vs nuclide
Radiopharmacy Preparation
- Generator
- Produces daughter radionuclide
- Eluate
- Generator collection product
- Mo-99 breakthrough
- Generator QC result
- Aluminum breakthrough
- Generator QC result
- Kit preparation
- Prepare radiopharmaceutical dose
- Radiochemical purity
- Desired chemical fraction
- Dose calibrator
- Measure dose activity
Agent Application
- Diagnostic agent
- Supports diagnostic imaging
- Therapeutic agent
- Delivers radionuclide therapy
- Tc-99m agent
- Common diagnostic category
- PET agent
- Positron imaging agent
- Adjunct drug
- Supports procedure protocol
- Blood labeling
- Radiolabel blood components
- Administration route
- Use prescribed route
SPECT vs PET
SPECT
- Gamma photon imaging
- Tomographic acquisition
PET
- Positron emission imaging
- Coincidence detection
Single photons vs coincidence
Instrument Systems
- Well counter
- Count small samples
- Survey meter
- Measure contamination exposure
- Gamma camera
- Planar photon imaging
- SPECT
- Tomographic gamma imaging
- PET
- Positron emission imaging
- CT
- X-ray cross-section imaging
- PACS
- Image storage network
Uniformity vs Resolution
Uniformity
- Consistent detector response
- QC consistency
Resolution
- Distinguish structures
- Image detail
Even response vs detail
Quality Control
- Constancy
- Check consistent response
- Uniformity
- Check detector consistency
- Center of rotation
- SPECT alignment check
- Energy resolution
- Separate photon energies
- Spatial resolution
- Distinguish small structures
- Attenuation correction
- Adjust tissue photon loss
- Artifact
- Nonclinical image feature
Five Domains
Physics, safety, agents, QC, clinical
7 percent13 percent40 percent
CAT vs Fixed Form
Classification CAT
- Pass/fail decision
- Different item sets
Fixed form
- Same item set
- Common administration
Adaptive classification vs fixed test
Blueprint Picker
- Need decay review→Physics(7 percent)
- Need detector review→Physics(Detection principles)
- Need ALARA review→Safety(13 percent)
- Need NRC review→Safety(Regulations and records)
- Need generator review→Agents(25 percent)
- Need agent review→Agents(Preparation and application)
- Need camera review→Instrumentation(15 percent)
- Need QC review→Instrumentation(Operations and artifacts)
- Need procedure review→Clinical(40 percent)
Clinical Workflow
- Patient identification
- Verify correct patient
- Order review
- Verify requested study
- Pre-exam screening
- Check preparation factors
- Informed consent
- Support authorized procedure
- Patient education
- Explain procedure precautions
- Positioning
- Prepare reproducible acquisition
- Image quality
- Evaluate diagnostic adequacy
Procedure Workflow
Screen, reconcile, acquire, evaluate, document
Patient safetyImage qualityClear record
Procedure Safety Scan
- Before procedure→Verify identity(Patient and order)
- Preparation needed→Screen patient(Protocol factors)
- Agent prescribed→Reconcile agent(Patient and dose)
- Dose prepared→Check quality(Follow procedure)
- Imaging begins→Position patient(Acquisition parameters)
- Image acquired→Evaluate quality(Artifacts and coverage)
- Safety concern→Follow emergency protocol(Escalate promptly)
- Therapy involved→Follow written directive(Authorized-user guidance)
- Procedure ends→Document and educate(Records and precautions)
Procedure Families
- Pulmonary
- Ventilation and perfusion
- Bone imaging
- Musculoskeletal procedure family
- Oncology
- Tumor imaging procedures
- Renal
- Genitourinary procedure family
- Endocrine
- Thyroid and parathyroid
- Cardiovascular
- Cardiac procedure family
- CNS
- Central nervous procedures
Common Traps
Scaled score ≠ percentage
375 is passing ≠ Scale is 200-500
CAT ≠ harder questions
Classification purpose ≠ Equated item sets
Pretest ≠ visible
Seamlessly included ≠ Cannot identify items
Domain weight ≠ order
Random content order ≠ Approximate proportions
SPECT/CT ≠ PET/CT
Gamma camera hybrid ≠ Positron camera hybrid
Clinical outline ≠ local protocol
Study content scope ≠ Follow authorized procedures
Last Minute
- 1.Prioritize Clinical Procedures: 40 percent
- 2.Review Agents: 25 percent
- 3.Review Instrumentation: 15 percent
- 4.Review Safety: 13 percent
- 5.Review Physics: 7 percent
- 6.Know 90-item CAT format
- 7.Remember 375 scaled passing score
- 8.Answer before moving forward
- 9.Cannot return to items
- 10.Use official COPS outline
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