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Physics > Nuclear medicine II > Flashcards

Nuclear medicine II Flashcards

1
Q

Primary interaction NaI in Tc99 imaging

A

Photoelectric (High Z material)

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2
Q

Energy resolution for Tc 99 m on Gamma camera

A

10 % (14%, because the FHWM)

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3
Q

Energy resolution

A

Photopeak broadening as a percentage of photopeak energy

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4
Q

If energy resolution is 10% (10% FWHM) what is the energy window

A

20%

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5
Q
A
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6
Q

What is the sensitivity range of well counter (contamination testing)

A

nCi

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7
Q

Pulse height analyzer window width

A

20%

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8
Q

What detectors DOES have gas and DOES NOT have NaI

A 
Dose calibrators (before injection measure). 
- Provide radioisotope info
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9
Q

What is ACLG used for QA

A

ACLG is used for dose calibrators

  • A: Accuracy annual
  • C: Constancy daily
  • L: Linearity quaterly
  • G: Geometry Installation

Dose calibrators have a high accuracy (injection within 20%)

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10
Q

Medium energy collimators

A

Ga 67
K 81
In 111

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11
Q

High energy collimators

A

I-131

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12
Q

Accuracy required for dose injected (NRC comission)

A

20%

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13
Q

Low energy collimator

A

Tc99 m and I123

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14
Q

Intrinsic

A

withou collimator (INdependent)

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15
Q

extrinsic

A

with collimator (EXtra)

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16
Q

What is this artifact?

A

Craked crystasl

17
Q

What is this

A

Photomultiplier not working

18
Q

What is this artifact

A

Ununiformity (captured using flood field)

Poor uniformity calibration

19
Q

Whatis this

A

Septal penetration

20
Q

How to decrease resolution of nM

A

Increase parallel hole colimator - patient distance

21
Q

Mottle of 100 counts/pixel in uniformioty flood?

A

10% (Mottle=1/square root of dose to receptor)

22
Q

Extrinsic system resolution of NM gamma camera

A

8 mm

23
Q

What is

A

Change energy window

24
Q

Pinhole

A

Thyroid

25
Q

Transmutation

A

Physics (3 decks)

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