Chapter 14: Nuc Med II

Question 1

PHA photopeak window is checked how often?

Answer 1

Daily

Question 2

How often is uniformity (extrinsic flood) tested with the Co57 disc?

Answer 2

Daily. Must be 2-3%.

+/- 5% is unacceptable.

Question 3

Bar pattern phantoms to check linearity are done how often?

Answer 3

Weekly

Question 4

High count uniformity (200 million for 128x128 matrix) how often?

Answer 4

Monthly.

Uniformity correction factors are obtained with the high count uniformity.

Question 5

Center of rotation is performed how often?

Answer 5

Monthly.

Uses point sources or line source.

Question 6

Head tilt angle is check with a bubble level HOW OFTEN?

Answer 6

Quarterly.

Question 7

SPECT phantoms (Jaszczak) are used HOW OFTEN to assess spatial resolution, uniformity, and image contrast?

Answer 7

Quarterly

Question 8

PET QC:

HOW OFTEN uniformity with a cylinder filled w/ a positron emitter?

Answer 8

Uniformity q 2 wks.

Question 9

PET QC:

HOW OFTEN detector calibration w/ positron source in FOV?

Answer 9

Vendor dependant.

Question 10

PET QC:

HOW OFTEN sensitivity (counters per MBq) using sleeved rod source?

Answer 10

PET sensitivity annually.

Like a required staff sensitivity training might be an annual requirement.

Question 11

PET QC:

HOW OFTEN count rate performance & scatter fraction tests using a line source in a cylinder

Answer 11

Annually

Question 12

PET QC:

HOW OFTEN spatial resolution?

Answer 12

Annually

Question 13

PET QC:

HOW OFTEN system performance (uniformity & hot sphere contrast using standard QC phantom)?

Answer 13

q 6 months

Question 14

PET QC annual tests?

Answer 14

Sensitivity
Spatial resolution
Scatter fraction & count rate

Question 15

PET QC tests more often than annual?

Answer 15

System performance (q 6 mo)
Uniformity (q 2 wk)

Question 16

Unsealed therapy radionuclide half-life: Phosphorus-32

Answer 16

14 days

polycythemia vera

Question 17

Unsealed therapy radionuclide half-life: Strontium-89

Answer 17

51 days
(osseous mets – prostate, breast)

Pure beta emitter no hazard except urine.

Question 18

Unsealed therapy radionuclide half-life:

Yttrium-90

Answer 18

3 days (technically 2.7 days)
(liver neoplasm, synovitis)

Question 19

Unsealed therapy radionuclide half-life:

Iodine-131

Answer 19

8 days (82% as 360 keV gamma rays)

Question 20

NRC is notified for medical events where unintended radiation exposures exceed __mSv effective dose, or __mGy organ doses.

Answer 20

50-mSv effective dose
or
500-mGy organ doses

Question 21

Release of 131I NM patients (NRC regulations) is allowed when their activity is less than ___ GBq.

Answer 21

1.2 GBq

Question 22

Critical organ: Tc-99m pyrophosphate

Answer 22

bone surfaces

Question 23

Critical organ: Tc-99m sulfur colloid

Answer 23

spleen

Question 24

Critical organ: Tc-99m HIDA

Answer 24

gallbladder

Question 25

Critical organ: Tc-99m RBC Cardiac MUGA

Answer 25

heart

Question 26

Critical organ: Tc-99m sestamibi cardiac rest/stress

Answer 26

gallbladder

Question 27

Critical organ: Tc-99m MAA lung

Answer 27

Lungs

Question 28

Critical organ: Tc-99m DTPA renal scan

Answer 28

Bladder

Question 29

Critical organ: Tc-99m pertechnetate thyroid scan

Answer 29

Colon