Chapter 14: Nuc Med II Flashcards
PHA photopeak window is checked how often?
Daily
How often is uniformity (extrinsic flood) tested with the Co57 disc?
Daily. Must be 2-3%.
+/- 5% is unacceptable.
Bar pattern phantoms to check linearity are done how often?
Weekly
High count uniformity (200 million for 128x128 matrix) how often?
Monthly.
Uniformity correction factors are obtained with the high count uniformity.
Center of rotation is performed how often?
Monthly.
Uses point sources or line source.
Head tilt angle is check with a bubble level HOW OFTEN?
Quarterly.
SPECT phantoms (Jaszczak) are used HOW OFTEN to assess spatial resolution, uniformity, and image contrast?
Quarterly
PET QC:
HOW OFTEN uniformity with a cylinder filled w/ a positron emitter?
Uniformity q 2 wks.
PET QC:
HOW OFTEN detector calibration w/ positron source in FOV?
Vendor dependant.
PET QC:
HOW OFTEN sensitivity (counters per MBq) using sleeved rod source?
PET sensitivity annually.
Like a required staff sensitivity training might be an annual requirement.
PET QC:
HOW OFTEN count rate performance & scatter fraction tests using a line source in a cylinder
Annually
PET QC:
HOW OFTEN spatial resolution?
Annually
PET QC:
HOW OFTEN system performance (uniformity & hot sphere contrast using standard QC phantom)?
q 6 months
PET QC annual tests?
Sensitivity
Spatial resolution
Scatter fraction & count rate
PET QC tests more often than annual?
System performance (q 6 mo) Uniformity (q 2 wk)
Unsealed therapy radionuclide half-life: Phosphorus-32
14 days
polycythemia vera
Unsealed therapy radionuclide half-life: Strontium-89
51 days
(osseous mets – prostate, breast)
Pure beta emitter no hazard except urine.
Unsealed therapy radionuclide half-life:
Yttrium-90
3 days (technically 2.7 days) (liver neoplasm, synovitis)
Unsealed therapy radionuclide half-life:
Iodine-131
8 days (82% as 360 keV gamma rays)
NRC is notified for medical events where unintended radiation exposures exceed __mSv effective dose, or __mGy organ doses.
50-mSv effective dose
or
500-mGy organ doses
Release of 131I NM patients (NRC regulations) is allowed when their activity is less than ___ GBq.
1.2 GBq
Critical organ: Tc-99m pyrophosphate
bone surfaces
Critical organ: Tc-99m sulfur colloid
spleen
Critical organ: Tc-99m HIDA
gallbladder
Critical organ: Tc-99m RBC Cardiac MUGA
heart
Critical organ: Tc-99m sestamibi cardiac rest/stress
gallbladder
Critical organ: Tc-99m MAA lung
Lungs
Critical organ: Tc-99m DTPA renal scan
Bladder
Critical organ: Tc-99m pertechnetate thyroid scan
Colon
