Radiation Dose in CT Imaging

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What does CTDI stand for in the context of CT dose measurement?

Cranial Tissue Density Indicator

Computed Tomography Dose Index (correct)

Centralized Total Dose Indicator

Center-to-Device Index

How is CTDI measured according to the provided text?

By calculating the radiation dose to the patient's center

With a pencil-type ionization chamber in head phantoms (correct)

Using an MRI machine

Using a digital radiography machine

What is the surface-to-center ratio for radiation doses in body scans?

1:1

1:2

3:1

2:1 (correct)

How is CTDIw calculated based on the text?

(2/3 CTDIperipheral + 1/3 CTDIcenter) Signup and view all the answers

Where are CTDI measurements made?

At the surface and center of the phantom Signup and view all the answers

What is unique about the radiation dose in CT compared to x-ray projection imaging?

Higher dose to slice volume due to rotational acquisition Signup and view all the answers

Which interaction mechanism is the principal one in CT leading to a considerable radiation dose from scattered radiation?

Compton scattering Signup and view all the answers

What does the Multiple Scan Average Dose (MSAD) in CT refer to?

The average dose from scatter radiation of adjacent slices Signup and view all the answers

Which type of radiation dose measurement is commonly used in CT imaging?

CTDI Signup and view all the answers

Why does the radiation dose to the slice volume tend to be higher in CT compared to chest radiography?

Techniques used for high SNR in CT imaging Signup and view all the answers

What feature of CT imaging results in an even distribution of dose compared to chest radiography?

Rotational acquisition in CT imaging Signup and view all the answers

Radiation Dose in CT Imaging

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Questions and Answers

What does CTDI stand for in the context of CT dose measurement?

How is CTDI measured according to the provided text?

What is the surface-to-center ratio for radiation doses in body scans?

How is CTDIw calculated based on the text?

Where are CTDI measurements made?

What is unique about the radiation dose in CT compared to x-ray projection imaging?

Which interaction mechanism is the principal one in CT leading to a considerable radiation dose from scattered radiation?

What does the Multiple Scan Average Dose (MSAD) in CT refer to?

Which type of radiation dose measurement is commonly used in CT imaging?

Why does the radiation dose to the slice volume tend to be higher in CT compared to chest radiography?

What feature of CT imaging results in an even distribution of dose compared to chest radiography?

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