Digital Fluoroscopy Bushong 26

What are the advantages of digital fluoroscopy over conventional fluroscopy?

Digital fluoroscopy's tube current is measured in hundreds of mA instead of less than [blank_start]5[blank_end] mA, as in image-intensifying fluoroscopy.

What is interrogation time?

Duty cycle is the time required for the x-ray tube to be switched off.

Pulse progressive fluoroscopy is [blank_start]reduces[blank_end] patient radiation dose.

The sensitive component of a CCD is a layer of crystalline silicon.

[blank_start]Progressive mode[blank_end] produces a sharper image with less flicker than [blank_start]interlaced mode[blank_end].

[blank_start]Mask mode[blank_end]: Method of temporal subtraction that results in successive subtraction images of contrast-filled vessels. [blank_start]Temporal subtraction[blank_end]: Computer-assisted technique whereby an image obtained at one time is subtracted from an image obtained at a later time. [blank_start]Hybrid subtraction[blank_end]: Technique that combines two types of subtraction. [blank_start]Time-interval difference (TID) mode[blank_end]: Technique that produces subtracted images from progressive masks and the frames that follow. [blank_start]Energy subtraction[blank_end]: Technique that takes advantage of changing contrast media during the time of the examination and require no special demands on the high-voltage generator. Uses two different x-ray beams alternately to provide a subtraction image that results from differences in photoelectric interaction.

[blank_start]Conventional[blank_end] fluoroscopy: Images generated directly from x-ray [blank_start]Digital[blank_end] fluoroscopy: Images produced by pulse-progressive fluoroscopy

In conventional fluoroscopy: - The input phosphor converts [blank_start]x-rays[blank_end] into light - [blank_start]Photocathode[blank_end] converts light into electrons - Output phosphor converts [blank_start]electrons[blank_end] back into light

In digital fluoroscopy: - x-rays are converted to [blank_start]light[blank_end] by a(n) [blank_start]image intensifier[blank_end] - [blank_start]light[blank_end] is converted to electrical signal by CCD