Fluke Biomedical 76-823 - Manual (Page 5)

Introduction
Introduction
1
1-1
Section 1
Introduction
1.1 Introduction
This manual provides information on the Model 74-823*, 74-824 and 74-825. Photon emission computed
tomography (PET/SPECD systems, like any imaging apparatus, require periodic performance testing.
This modular phantom helps provide the data for such evaluations. It permits measurements of the
resolution of "hot" lesions in a cold field, "cold" lesions in a "hot" (or radioactive) field, linearity, uniformity
of response to a uniform field, and a simple way to find the center of rotation. In addition, a more
sophisticated test suitable for acceptance testing may be done by measuring the point spread function,
from which the MTF may be calculated.
Figure 1-1 PETISPECT
1.2 Components
Tank
Acrylic, 8 ½ OD x 8" ID x 12 ½" long. Has an o-ring sealed cover with fill and drain ports. One of the port
plugs will accept a micro-hematocrit capillary tube that is used to get a point-spread function for MTF
measurements. Includes supports for holding the tank in a horizontal position.
"Hot" Lesion Resolution Insert
Acrylic, 7-7/8" OD x 2 ½” thick. Eight pairs of holes are drilled through the block, each pair separated by a
distance equal to the hole diameters (4.7, 5.9, 7.3, 9.2,11.4, 14.3, 17.9 and 22.4 mm). The diameter of
each pair is 25% larger than that of the preceding pair.
"Cold" Lesion Resolution Insert
7-7/8" OD x 3" thick. Contains 7 plastic rods whose diameters are 5.9, 7.3, 9.2, 11.4, 14.3, 17.9 and 22.4
mm. Each rod is 25% larger in diameter than the preceding one. Plastic spheres of the same diameter as
the rods can be attached on standoff supports to the outside of this insert. The centers of all the spheres
fall into a single plane.
* Designed and developed by Ray A. Carlson, Hutzel Hospital, Detroit, MI, and Jeffrey T. Colvin, Texas Oncology PA, Dallas, TX