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Exam 15: Beam Restriction

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Question 21

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When kilovoltage is increased with no other changes in technical factors, fewer scattered photons will result.

A) True
B) False

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Question 22

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When more photons are absorbed photoelectrically, the resulting radiograph has

A) greater image distortion.
B) less image distortion.
C) greater radiographic image density.
D) less radiographic image density.

E) A) and B)
F) C) and D)

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Question 23

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Penumbra is a geometric unsharpness around the periphery of an image.

The ____ the atomic number of the irradiated material, the ____ the number of photoelectric absorption interactions will be, and the ____ the scatter produced.

The principal factors that affect the amount of scatter produced are mAs and the type of irradiated material.

The diameter of the lower rim of a cone is 5 inches.The bottom of the cone is placed at a distance of 15 inches from the focal spot.What will be the size of the projected image at a 40-inch SID?

As the volume of irradiated tissue ____, the amount of scatter produced ____.

All of the following are considered beam-restricting devices EXCEPT

As the kilovoltage increases, the percentage of photons that undergo a ____ interaction will decrease.

Bone absorbs more radiation and produces more scatter than soft tissue.

Cones and cylinders would be commonly employed for the following examinations EXCEPT

As the kilovoltage increases, the percentage of x-rays that undergo ____ interactions will increase.

Collimators that offer positive beam limitation (PBL) are very popular with technologists for a variety of reasons.Even though the federal requirement for PBL has been repealed, their popularity has continued and most department managers consider PBL as a "standard equipment" feature.PBL is electronically and mechanically highly engineered technology and subject to abuse by the inattentive and unprofessional radiographer.In the event of a PBL failure during an examination, what circumstances will be evident to the radiographer and what can he/she do to overcome the PBL error and continue with the procedure.

A radiographer can best reduce the amount of scatter radiation from reaching the receptor by

The volume of the irradiated tissue increases as

The collimation assembly of a radiographic unit

A radiographer can best minimize the amount of scatter radiation reaching the image receptor by restricting the beam.

Automatic collimators are known as positive beam limitation (PBL) devices.

PBLs may also filter the x-ray beam.

A factor that affects the amount of scatter produced is