JPNM Physics

Park Medical Systems, Inc.



3/8" and 1/2" crystals

Document created August 30, 1996; Copied from document dated April 19, 1996 received by FAX on August 30, 1996 from Park;

Typical Values in UFOV

The Useful Field of View (UFOV) = 16.5" x 22.3" (419 mm x 566 mm);

3/8" Crystal1/2" Crystal
Intrinsic Spatial Resolution
(measured @140 keV with count rate < 20,000 cps)
FWHM2.7 mm3.0 mm
FWTM5.1 mm 5.7 mm
Intrinsic Energy Resolution
(measured @ 140 keV with count rate < 20,000 cps)9.5%9.8%
Intrinsic Flood Field Uniformity
(measured @140 keV with count rate < 20,000 cps)
Integral+/- 2.0%+/- 2.0%
Differential+/- 1.5%+/- 1.5%
Multiple Window Spatial Registration Error
Maximum error within the 84 keV to 330 keV energy
window (measured with 67Ga : 93, 184, and 300 keV, 15, 20, and 20% windows, respectively).
<0.2 mm<0.2 mm
Intrinsic Count Rate Performance (per detector)
20% window maximum230,000 cps230,000 cps
20% window / 20% loss150,000 cps150,000 cps
Intrinsic Uniformity @ 75,000 cps
Integral+/- 4.0%
Differential+/- 3.5%
System Spatial Resolution without Scatter
(LEUHR cast collimator, distance 10 cm)
FWHM7.2 mm
FWTM12.6 mm
System Spatial Resolution with Scatter
(LEUHR cast collimator, distance 10 cm)
FWHM7.9 mm
TWTM15.2 mm
System Sensitivity
LEGP cast collimator280 cpm/uCi280 cpm/uCi
LEHR cast collimator190 cpm/uCi190 cpm/uCi
LEGP cast collimator145 cpm/uCi145 cpm/uCi
Reconstructed System Spatial Resolution
(LEUHR cast collimator)
Average radial FWHM10.1 mm
Average tangential FWHM8.6 mm
Average central FWHM9.1 mm
Additional Performance Specifications
System Sensitivity (for 18F)
Ultra High Energy (UHE) cast collimator150 cpm/uCi200 cpm/uCi

Note: Park Medical Systems Inc. reserves the right to revise these specifications without notice. Where possible, all measurements were performed in strict adherence with the NEMA protocols as developed for the Anger scintillation camera published in August 1994. The ISOCAM systems are scintillation cameras in which the spatial and energy values are determined via software-based algorithms rather than by hardware-based algorithms.

Douglas J. Wagenaar, Ph.D.,