Exam 6: Digital Fluoroscopy

In ____, a pre-contrast image referred to as a mask image is first obtained and post-contrast images are then digitally subtracted from the mask image.

The range of the numbers in FPDs is defined as the window level and the center of the range is defined as the window width.

The output screen is coated with a ZnCdS phosphor that converts the photoelectrons into light.

The operational elements of a dynamic FPD involve three sequences, resulting in a single ____________________ that must be completed in at least 33 ms for fluoroscopy.

Which process produces a new image that is subsequently added to the original image to produce the final image, referred to as the edge-enhanced image?

The image intensifier tube has been developed to replace the conventional fluorescent screen of the early ____________________.

Dynamic FPD detectors were first used in GI tract fluoroscopy and then later in angiography.

Which of the following is an image-processing technique used to reduce the radiation dose to the patient?

The computer operates on the data it receives from the ADC in ____ format.

Digital fluoroscopy systems with an image intensifier and video camera (both television camera tubes and CCD cameras)in the imaging chain have been replaced with ____.

Which of the following changes the contrast and brightness of an image display?

A pre-contrast image, referred to as a(n)____________________ image, is first obtained and post-contrast images are then digitally subtracted from the mask image.

Which of the following was developed to solve the image quality problems imposed by the fluoroscopic screen of the early fluoroscopes?

____________________ subtraction involves the digital subtraction of images in time.

In the case of ____________________ scanning, 262.5 odd lines (one TV field)are first scanned, followed by 262.5 even lines (one TV field).

____ refers to the brightening of the fluoroscopic image using the image intensifier.

_________________ of the image in conventional fluoroscopy is an important feature of the image intensifier.

The purpose of ____________________ frame averaging is to reduce the noise present in an image by continuously displaying an image that is created by averaging the current frame with one or more previous frames of digital fluoroscopic image data.

Which system couples the video camera to the television monitor by means of a coaxial cable and control electronics?

Modern conventional fluoroscopy imaging units use a high frequency generator to ensure efficient production of ____________________.