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FRCR Part 1 Physics > Image Quality in Nuclear Medicine (Erin) > Flashcards

Image Quality in Nuclear Medicine (Erin) Flashcards

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1
Q

In NM does longer acquisition time increase or reduce noise?

A

Reduces noise

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2
Q

In NM studies does increased activity of the radiopharmaceutical increase of reduce noise?

A

Reduces noise

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3
Q

Does increasing the sensitivity of the gamma camera increase of reduce noise

A

Reduces noise

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4
Q

Does increased sensitivity of the gamma camera increase or decrease SR and contrast

A

Decreases

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5
Q

What is the effect of a thicker scintillation crystal on spatial resolution

A

Decreases spatial resolution

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6
Q

What is the effect of a smaller number of PMT on spatial resolution?

A

Reduced spatial resolution

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7
Q

What is the effect of large diameter holes in the collimator on image SR

A

Reduces SR

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8
Q

What is the effect of short holes in the collimator on image SR

A

Reduces SR

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9
Q

What is the effect of patient motion on image SR

A

Reduces SR

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10
Q

What is the effect of imaging deeper structures on SR

A

Decreases SR

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11
Q

What is the effect of increased scattered radiation on SR

A

Decreases SR

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12
Q

What is the effect of a larger patient/detector distance on SR

A

Decreases SR

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13
Q

What is the effect of long length holes in the collimator on SR

A

Improves SR
However increased noise

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14
Q

What is the effect of decreased scattered radiation on image SR

A

Improves SR

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15
Q

What is the effect of smaller diameter holes in the collimator on image SR

A

Improves SR
However also increases noise

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16
Q

What is the effect of a thinner scintillation crystal on SR

A

Improves SR

17
Q

In PET:
What is the dead time

A

Time following detection in which detector insensitive to further incident gamma photons calculated and counts corrected for

18
Q

In NM what is the effective a smaller matrix on SNR

A

Better SNR

19
Q

What is the typical matrix size in gated cardiac imaging

A

64x64

20
Q

What is the typical matrix size in dynamic imaging

A

128x128
or 256x256

21
Q

What is the typical matrix size used in static imaging

A

256x256

22
Q

In PET what is the effect of a wider photo peak acceptance window on contrast and noise

A

Decreases noise
Decreases contrast

23
Q

In PET how does thickness of the scintillation crystal affect SR

A

Thicker crystal = poorer SR
Thinner crystal = improved SR

24
Q

Why is noise less in PET than SPECT

A

PET has a much higher count rate - so noise is less of an issue

25
Q

Pet vS SPECT: which has more noise?

A

SPECT

26
Q

PET VS SPECT: Which has better resolution?

A

PET

FRCR Part 1 Physics (20 decks)

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