Test: PET Quiz 1 (employee training


PET Quiz 1Versión en línea Powerpoint quiz we received in class. por Joshua Liberty 1 PET has higher resolution than MRI. a True b False 2 Dimensions of crystals and the amount they are apart accounts for high resolution of PET. a True b False 3 Proton rich nuclei acheive stability by B+ emission or EC. a True b False 4 The Tp of Ga-68 is 2 hours. a True b False 5 The Tp of Nitrogen-13 is 10 minutes. a True b False 6 The Tp of Rb-82 is 75min. a True b False 7 Ga-68 is produced in a cyclotron. a True b False 8 Oxygen-15 is prodcued in a cyclotron. a True b False 9 A patient is being scanned in a BGO PET scanner; there is a lot of scatter; the best solution is to rescan the patient with a narrow energy window. a True b False 10 Singles may not be counted, but must be held by scanner until CTW closes. a True b False 11 During times when there is less activity within PET FOV, randoms and scatters increase. a True b False 12 An LSO crsytal would have fewer randoms than a BGO crystal. a True b False 13 An LSO crsytal would have better stopping power than a BGO crystal. a True b False 14 PET detects ______% of patient produced 511 KeV photons. a 90 b 10 c 5 d 1-2 e 50 15 The B+ decays equation is? a n=p+B+ v + energy b P=n+B+ v + energy c B+ + e- =0.511 KeV + 0.511 KeV d P=n+B+ v + antineutrino 16 2 511 KeV photons detected by opposite detectors in coincidence ( at the same time). a Singles event b Scatter event c Line of response (511 KeV straight line) d Random event 17 A coincidence timing window (CTW) is usually ______? a 5-15 ns b 5-15 ms c 5-15 sec d 5-15 usec 18 2 atoms decay at almost same time, photons from 2 different annihilation events are picked up within the timing window; this is called? a Scattered event b Random event c True d Single event 19 What is the solution for random events in PET? a Thicker crystals b TOF c Lead septa in between rings of detectors d <12 ns window (reduced) is used and those 511 KeVs outside window are thrown out e More PMTs in each block 20 No collimator is neede for PET due to? a Thickness of crystals b Almost silmultaneous recognition of 2 511 KeV photons, which is used to locate gamma rays from patient. c Lead septa in between rings of detectors d Energy of Rphx 21 Location (or point within LOR) of AR can be inferred by measuring the time of arrival of the 2 511 KeV photons at opposite crystals; this is called? a True event b Concidence timing window c Line of response d Time of flight 22 A BGO PET crystal had? a Faster scintillator crystal than LSO b More stopping power than NA I (Tl) c Better energy resolution than LSO d Faster scintillator crystal than LSO and Better energy resolution than LSO e All of these Feedback 9 You want to widen the window to let more in not narrow.

1

PET has higher resolution than MRI.

a

True

b

False

2

Dimensions of crystals and the amount they are apart accounts for high resolution of PET.

a

True

b

False

3

Proton rich nuclei acheive stability by B+ emission or EC.

a

True

b

False

4

The Tp of Ga-68 is 2 hours.

a

True

b

False

5

The Tp of Nitrogen-13 is 10 minutes.

a

True

b

False

6

The Tp of Rb-82 is 75min.

a

True

b

False

7

Ga-68 is produced in a cyclotron.

a

True

b

False

8

Oxygen-15 is prodcued in a cyclotron.

a

True

b

False

9

A patient is being scanned in a BGO PET scanner; there is a lot of scatter; the best solution is to rescan the patient with a narrow energy window.

a

True

b

False

10

Singles may not be counted, but must be held by scanner until CTW closes.

a

True

b

False

11

During times when there is less activity within PET FOV, randoms and scatters increase.

a

True

b

False

12

An LSO crsytal would have fewer randoms than a BGO crystal.

a

True

b

False

13

An LSO crsytal would have better stopping power than a BGO crystal.

a

True

b

False

14

PET detects ______% of patient produced 511 KeV photons.

a

90

b

10

c

5

d

1-2

e

50

15

The B+ decays equation is?

a

n=p+B+ v + energy

b

P=n+B+ v + energy

c

B+ + e- =0.511 KeV + 0.511 KeV

d

P=n+B+ v + antineutrino

16

2 511 KeV photons detected by opposite detectors in coincidence ( at the same time).

a

Singles event

b

Scatter event

c

Line of response (511 KeV straight line)

d

Random event

17

A coincidence timing window (CTW) is usually ______?

a

5-15 ns

b

5-15 ms

c

5-15 sec

d

5-15 usec

18

2 atoms decay at almost same time, photons from 2 different annihilation events are picked up within the timing window; this is called?

a

Scattered event

b

Random event

c

True

d

Single event

19

What is the solution for random events in PET?

a

Thicker crystals

b

TOF

c

Lead septa in between rings of detectors

d

<12 ns window (reduced) is used and those 511 KeVs outside window are thrown out

e

More PMTs in each block

20

No collimator is neede for PET due to?

a

Thickness of crystals

b

Almost silmultaneous recognition of 2 511 KeV photons, which is used to locate gamma rays from patient.

c

Lead septa in between rings of detectors

d

Energy of Rphx

21

Location (or point within LOR) of AR can be inferred by measuring the time of arrival of the 2 511 KeV photons at opposite crystals; this is called?

a

True event

b

Concidence timing window

c

Line of response

d

Time of flight

22

A BGO PET crystal had?

a

Faster scintillator crystal than LSO

b

More stopping power than NA I (Tl)

c

Better energy resolution than LSO

d

Faster scintillator crystal than LSO and Better energy resolution than LSO

e

All of these

Feedback

9

You want to widen the window to let more in not narrow.

PET Quiz 1

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