Physics Chapter 22

20問 • 1年前

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通報

問題一覧

Image-forming x-rays include those which have been ________.

transmitted without interaction and scattered through Compton interaction

Which kVp selection would result in the most scattered x-rays in the image-forming beam?

90 kVp

Approximately __% of the x-ray beam incident on the patient is transmitted through the patient without interaction to become part of the image-forming beam.

The x-ray interaction that contributes to the clear parts of the image is _____.

photoelectric interaction

Compton scatter contributes to _______.

image noise

The three primary factors influencing the intensity of scatter in the image-forming beam are ________.

kVp, field size, and patient thickness

Decreasing the kVp will increase ______.

patient pose

Photoelectric interactions increase when _____ is decreased.

kVp

Scatter radiation increases as ________ increases.

field size

The x-rays that are transmitted through the patient without interaction contribute to _________.

useful information

Contrast resolution is improved by _________.

tight collimation, lowering kVp and patient compression

A fixed aperture diaphragm should leave a ___cm unexposed border on the film.

The most commonly used beam restricting device is the ________.

variable collimator

The use of a compression device will increase _____.

image contrast

Lowering kVp ____ patient dose and ______ image contrast.

increases; increases

The use of ________ improves contrast and reduces patient dose.

collimation

The positive beam limiting device (PBL) assures that the x-ray beam is collimated to _________.

1 cm outside image receptor size

Federal regulations passed in ____ required that positive beam limiting devices be on all manufactured x-ray collimators.

1974

Beam restriction with a(n) ______ is only accurate at a fixed SID.

aperture diaphragm

How can you improve image contrast with a heavy patient without increasing patient dose?

Use tight collimation.

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問題一覧

Image-forming x-rays include those which have been ________.

transmitted without interaction and scattered through Compton interaction

Which kVp selection would result in the most scattered x-rays in the image-forming beam?

90 kVp

Approximately __% of the x-ray beam incident on the patient is transmitted through the patient without interaction to become part of the image-forming beam.

The x-ray interaction that contributes to the clear parts of the image is _____.

photoelectric interaction

Compton scatter contributes to _______.

image noise

The three primary factors influencing the intensity of scatter in the image-forming beam are ________.

kVp, field size, and patient thickness

Decreasing the kVp will increase ______.

patient pose

Photoelectric interactions increase when _____ is decreased.

kVp

Scatter radiation increases as ________ increases.

field size

The x-rays that are transmitted through the patient without interaction contribute to _________.

useful information

Contrast resolution is improved by _________.

tight collimation, lowering kVp and patient compression

A fixed aperture diaphragm should leave a ___cm unexposed border on the film.

The most commonly used beam restricting device is the ________.

variable collimator

The use of a compression device will increase _____.

image contrast

Lowering kVp ____ patient dose and ______ image contrast.

increases; increases

The use of ________ improves contrast and reduces patient dose.

collimation

The positive beam limiting device (PBL) assures that the x-ray beam is collimated to _________.

1 cm outside image receptor size

Federal regulations passed in ____ required that positive beam limiting devices be on all manufactured x-ray collimators.

1974

Beam restriction with a(n) ______ is only accurate at a fixed SID.

aperture diaphragm

How can you improve image contrast with a heavy patient without increasing patient dose?

Use tight collimation.