Key features include mounting and set-up that allow the Specphan™ phantom itself to be scanned off the table in the air, eliminating the table attenuation issue and enabling the user to position the detector(s) as close to the phantom as needed. This mount design simplifies and speeds the acquisition set-up time and increases the reproducibility of the QC measurements.
The mounting procedure is simple. The Specphan™ phantom case is placed on the patient table and is secured by wrapping the case's velcro strap around the table. An extension piece is fitted onto the case and the phantom is then affixed to this extension thus suspending it in air between the detector(s). The phantom is quickly leveled by turning an adjustment knob on the extension piece.
The design of the Specphan™ phantom was developed in response to a number of performance standard groups' test proposals, including: (1) the American Association of Physicists in Medicine (AAPM) "Quantitation of SPECT performance: Report of Task Group 4,
Nuclear Medicine Committee"
(2) the National Electrical Manufacturers Association (NEMA) "Nuclear Medicine Section Recommendations for implementing SPECT instrumentation quality control.
The Specphan™ phantom contains four main imaging sections and inserts described in the following pages:
Slice Width, Pixel Size and High
Point Source Insert
Image Uniformity and Noise Section
Low Contrast Inserts