Fluoro 25 & 26

Which may be used to record fluoro images? 1. photospot camera 2. cathode ray tube 3. cassette spot film

1 & 3

Which of the following are attributes of energy subtraction? 1. rapid kVp switching is required 2. Motion artifacts are a problem & require remarking 3. more subtraction images are possible

1 & 3

Which of the following are advantages of flat panel IR's? 1. unaffected by external magnetic fields 2. improved contrast at the image center but degrades around image periphery 3. distortion free images 4. does not degrade with time or use

1, 3, & 4

The federal exposure rate limits for fluoro is:

100 mGyt/min

Interventional radiology procedures may result in a skin dose of:

1000 mGyt

In digital fluoro, all of the following reduce pt dose except: 1. pulsed xray beam 2. greater sensitivity of the CCD in spot imaging 3. decreased exposure time 4. over imaging by the physician

4

The kV range typically used for fluoro during a BE is:

80-90

Factors that affect the brightness of the fluoroscopic image include: 1. kVp 2. Patient Size 3. mA

All of the above

Which feature on a fluoroscope allows the radiologist to select an image brightness level that is subsequently maintained automatically by varying the kVp, the mAs, or both?

Automatic Brightness Control

Which portion of the CCD receptor illuminates along with the light output by the II of the fluoro system?

Crystalline silicone

The imaging modality that provides a real-time, continuous image of the motion of internal structures while the X-ray tube is energized is:

Fluoroscopy

In the formation of the raster pattern, the movement back to the left side of the screen while the electron beam is blanked, or turned off, is called:

Horizontal retrace

Which mode of video systems allows the electron beam of the TV camera tube to cover the entire area and eliminate the merging of two line sets of information?

Progressive

Which device is needed to perform quality control check of fluoro exposure rates?

RAD Dosimeter

Which term demonstrates the amount of info apparent in an image compared to the amount of info lacking in the same image?

SNR

True or False: Digital fluoro has surpassed conventional fluoro in methods for which the image is obtained, the quality of the obtained image, and the reduction in pt dose during imaging.

True

True or False: Fluoroscopy is best viewed at illumination levels of 100 to 1000 lux

True

True or False: Magnification during fluoro is only possible with a multi field II tube

True

Which are advantages of TV image monitoring of fluoro? 1. remote viewing of fluoro exam 2. electronic control of brightness level and contrast 3. multiple persons can view the image at the same time

all of the above

How is the TV image formed during fluoro?

by transforming the visible light image of the II tube's output phosphor into an electrical video signal

The electron gun of the TV camera tube is part of the:

cathode

Which structures of the eye are used to view radiographic and fluoroscopic images?

cones of the eye

The post processing method of digital image subtraction provides better image ________________ resolution.

contrast

Which portion of the CRT modulates the intensity of the electron beam?

control grid

In the pulse-progressive fluoro mode, the time required for the X-ray tube to switch off is termed:

extinction time

Which video image quality factor is determined by bandpass?

horizontal resolution

Which portion of the II tube receives the remnant radiation from the patient?

input phosphor

If the fluoro image may be viewed and recorded at the same time, then the II tube is coupled by:

lens coupling

Which modes of subtraction are subgroup methods of temporal subtraction?

mask mode & time interval difference mode

Which recording device used in fluoro obtains images at the lowest pt dose?

photospot camera

The process of shifting one or more pixels in order to adjust the mask image after motion or appearance of other artifacts is termed:

reregistration

Which subtraction mode has the subtracted image being made from a different mask image each time?

time interval difference mode