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Image Characteristics of PET Scan in Nuclear Medicine

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Image Characteristics of PET Scan in Nuclear Medicine

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Questions and Answers

What is the primary purpose of the contrast-to-noise ratio in PET scan devices?

To evaluate the difference between the signal of interest and other regions (correct)

To calculate the timing accuracy of the line of response

To increase the spatial resolution of the image

To measure the background signal from tissues

What is the effect of Compton-scattered y-rays on the image SNR?

It has no effect on the SNR

It increases the SNR

It is irrelevant to PET scan devices

It contributes to the degradation of the SNR (correct)

What is the formula to calculate the CNR of a PET scan device?

CNR = (µo − µB )/σB (correct)

CNR = (µo ÷ µB )/σB

CNR = (µo + µB )/σB

CNR = (µo × µB )/σB

What is the purpose of low-pass filters in post-acquisition processing?

To increase the signal-to-noise ratio of the image Signup and view all the answers

What is the line of response in PET scan devices?

A line that defines the photon pair collision Signup and view all the answers

What is the challenge in verifying the line of response?

Achieving high timing accuracy Signup and view all the answers

What is the effect of the presence of background signal from tissues on the image CNR?

It has no effect on the CNR Signup and view all the answers

What is the purpose of image processors in PET scan devices?

To analyze tens of thousands of LORs Signup and view all the answers

What is the relationship between the image CNR and the image SNR in nuclear medicine?

The CNR is essentially equal to the SNR Signup and view all the answers

What is the purpose of the region of interest in PET scan devices?

To define the area being examined Signup and view all the answers