Fluke Biomedical 76-810 - Manual (Page 5)

Introduction
Definition
1
1-1
Section 1
Introduction
1.1 Definition
Transmission test patterns provide an indication of both the intrinsic and system resolution capabilities of
a gamma camera. They can also provide a measure of field size and linearity. It is important to obtain
images of these patterns at the time the camera is tuned. These should be repeated periodically and
compared with the original. The images provide a prompt and sensitive indication of any loss in image
quality and alert the user to the need for service.
The image quality and resolution capabilities depend on many factors such as:
a. Gamma ray energy
b. Window width
c. Collimator
d. Information density
e. Count rate
f. Distance from collimator
g. Amount of scattering material
h. Type of data processing
i. Type of photographic system and film
Transmission test patterns provide a convenient means of studying how these different parameters affect
image quality and can be helpful in optimizing their choice.
1.2 Equipment Required
• A transmission test pattern suitable for the resolution capabilities and size of the camera being
tested such as one of the following:
1. Quadrant Bar Test Pattern
a. Standard Field Camera, up to 14 in (D)
Model No. Bar Widths (inches)
76-818 3/8, 1/4, 3/16, 1/10
b. Large-Field Camera, up to 16 in (D)
Model No. Bar Widths (inches)
76-814 3/8, 1/4, 3/16, 1/8
76-815 3/8, 1/4, 3/16, 1/10
2. Hine-Duley Test Pattern
Model No. Bar Spacing
76-810 1/4, 3/16, 5/32