Radiation Safety And Dosimetry In Ct

Front 1

The two technical factors affecting CT radiation dose can be divided into two categories:

Back 1

System configuration and user settings

Front 2

The individual technical configuration of a CT system determines several characteristics that may affect patient dose:

Back 2

source -detector distance

filtration

detector efficiency

overranging

noise reduction algorithms (adaptive filters)

Cone-shaped beam

Front 3

Source-detector distance:

As the distance from the x-ray tube to the detectors decrease dose increases or decreases

Back 3

increases

Front 4

___________ acts to remove the unwanted "low-quality" portion of the x-ray beam that adds to the patient radiation dose while failing to yield useful acquisition data.

Back 4

filtration

Front 5

These two types of filters are also added to the x-ray tube to compensate for the noncylindrical nature of most body parts.

Back 5

beam-shaping and bow-tie

Front 6

The ability of the detector to capture transmitted x-ray quanta and produce the appropriate

response.

Back 6

inherent absorption efficiency

Front 7

The spatial arrangement of detector elements, including the amount of interspace material required between adjacent element.

Back 7

geometric efficiency