Ch. 32 and 33

What does the accept image or deliver button do?

• Restores all adjusted settings to original values

• Sends the image with its current settings into a file in the PAC system

• Sends the entire study into the PAC system for storage

• Sends an image directly to a printer without being saved into the PAC system

What does the speed of any imaging system express?

• how fast the image can be sent to PACS

• how fast the image can be obtained

• how fast the computer can process the image

• The imaging system's sensitivity to radiation

What can cause an unacceptable level of mottle noise in the image?

• Insufficient techniques resulting in low exposure indicators

• Very high exposure indicators

• inadequate positioning of the part

• None of the above

What can cause exposure indicator errors?

• extreme underexposure

• Extraneous exposure information, including scatter

• Delay in processing

• All of the Answers

What is the primary function of exposure indicator?

• To increase the speed of imaging systems

• To help RT avoid overexposure to the patient

• To reduce the cost of imaging equipment

• To improve image resolution

What is the purpose of smoothing algorithms?

• All of the above

• To recover lost information due to underexposure

• To smooth out hard lines on the image

• To suppress small amounts of mottle in the image

What is the purpose of dark masking in image processing?

• Resizes the image

• Stitches multiple images together

• Reverses the image to 'black-on-white'

• Reverses blank areas around the image to black border

kVp levels can be increased by __% for technique charts without substantial generation of scatter radiation.

• 15

• 17

• 30

• 25

What is defined as the margin for exposure error, or the range of exposures that can produce an acceptable image for a particular imaging system?

• exposure indicator

• exposure generator

• exposure latitude

• exposure range

For digital systems, a much wider margin for error is allowed, especially in the direction of _.

• overexposure

• underexposure