Exam 6: Digital Fluoroscopy

The ____________________ operation is based on subtraction of images taken at different kVs.

Through the years, fluoroscopy has developed into a sophisticated imaging system as new technologies have emerged to improve its imaging system characteristics.

____ uses an image intensifier coupled to a video camera that converts the image from the output screen of the image intensifier into a video signal.

Conventional fluoroscopy with an image intensifier operates in the low mA mode, and therefore the noise level is usually high.

____ is the continued emission of light from the screen when the radiation beam has been turned off.

The X-ray tube used in fluoroscopy must be capable of producing X-rays either continuously or in long series.

In digital fluoroscopy, the display image receives the video signal from the video camera and with suitable electronics, uses the signal to create the television image.

The ____________________ ratio of an image intensifier tube is the ratio of the image brightness at the periphery to that at the center of the output screen.

The energy subtraction operation is based on subtraction of images taken at different ___________________.

In fluoroscopy, a ____ converts the light from the output screen of the image intensifier into an electrical signal (output video signal), which is sent to the television monitor where it is converted into a visible image that can be viewed in real time.

Early fluoroscopy had to be performed in the dark using ____ for dark adaptation.

All digital imaging modalities, including digital fluoroscopy, make use of various types of image post-processing algorithms (software), essentially to manipulate the image presented to the observer in order to enhance diagnostic ____________________.

At the heart of a digital fluoroscopy imaging system is a(n)____________________ computer, a minicomputer system capable of receiving dynamic digital data from the ADC and processing it quickly for image display and subsequent storage.

A(n)____ couples the video camera to the television monitor by means of a coaxial cable and control electronics.

In some systems, it is possible to adjust the pixel size by ____________________ four pixels into one larger pixel.

A digital image is made up of a matrix of pixels in which each pixel is assigned a number and each number corresponds to a(n)____________________.

The ____________________ is a high-frequency generator and can provide the high mA values used in digital fluoroscopy, as opposed to the low mA values typical of conventional fluoroscopy.

Digital fluoroscopy can be applied to both gastrointestinal (GI)tract imaging and DSA, and the image ____________________ operations are specific to each application.

The exposure rate for a ____ cm mode is about 30 while it is 60 11ec6bd3_b879_2049_bb89_052ef0a603dd_TB2055_11 , and 120 11ec6bd3_b879_2049_bb89_052ef0a603dd_TB2055_11 for the 17 cm and 12 cm modes respectively

DSA has advanced from film-based imaging using image intensifier/video camera technology to imaging with dynamic FPDs.