PROTEUS XR/a
GE MEDICAL SYSTEMS
Operator Manual
REV 11
DIRECTION 2259724-100
8-5
8-2-5 Applications for Detector Areas
Applications for the detector areas are given in Table 5-1
For example, one application for the ion chamber detector is chest radiography.
•
In this application area 1 and area 3 must be located in line with radiation
transmitted through the left and right lung fields, so that areas 1 and 3 are
not influenced by variations in tissue opacity caused by the heart or
vertebrae.
If the patient is improperly positioned and the sensing areas are exposed to
direct radiation, the phototimed exposures will be too short and the films
underexposed.
The opposite will be true if the patient’s thoracic spine or sternum is
positioned over the sensing areas.
•
The basic positioning requirements are also important when using area 2.
Misalignment may result in unusable film. Therefore, care should be taken
when positioning the area of interest over area 2.
1. Before positioning the patient, align the x-ray tube to the center of area 2.
2. Collimate the light field to an area of 205mm-230mm. This light field is
now cen-tered on area 2 and encompasses two sides of areas 1 and 3.
See Illustration 8-3.
3. Position the patient’s area of interest within the light field. Readjust the
light field to the desired size. The detector sensing area is now aligned
with the patient area of interest.
•
When using area 2 only, a light field (51mm-102mm), if properly centered,
will define that area and can be used to align a particular body portion with
it.
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