COLLIMATOR TEST

AOI

is a specific part of the body that is being focused on, studied, or imaged during a medical procedure.

Collimator

limits the x-ray beam to the AOI using adjustable shutters.

Shutters

metal plate that controls the size and shape of the x-ray beam by limiting the field of radiation

every 6 months

Light field alignment and scale accuracy test:

annually

visual inspection:

100 cm

Procedure: set the FFD to (blank) cm

Scale settings

Procedure: Compare actual light size to the (blank) on the collimator

Shutter Chain Drive

used to control the movement of the shutter

x-ray engineer

if misalignment or scale inaccuracy is found and cannot be corrected easily, call a

engineer/bio-med technicians

the ones who change the collimator light bulb

quartz bulb

high temperature resistant glass bulb made from fused quartz or silica instead of regular glass.

Halogen bulb

a type of incandescent lamp that contains a small amount of halogen glass (iodin/bromine) along with tungsten filament.

tungsten filament

a material that extends the light of the bulb

2%

the difference between the light field and the x-ray field should not be more than (blank) of the SID in any direction.

once a year or everytime the bulb or mirror is changed/ater service changed/after

Frequency for x-ray beam alignment test: