HEADTOME III: A high quantitation and high resolution brain positron emission tomograph

Conference · Sun Jan 01 04:00:00 EST 1984 · J. Nucl. Med.; (United States)

OSTI ID:7087721

Kanno, I; Miura, S; Murakami, M; Uemura, K; Hirose, Y; Takahashi, S

HEADTOME III, a high quantitation and high resolution positron emission tomograph (PET) has been developed. HEADTOME III was basically designed as a brain PET of 3 rings 5 planes. Each ring (75 cm diam) consists of 160 BGOs (13.4 x 25 x 40 mm). Shadow masks and septa can be used independently, corresponding to low (LR) and high resolution mode (HR), and low (LQ) and high quantitation mode (HQ) respectively. Planar resolutions at the center of the field of view (FOV) were 8.2 and 6.5 mm FWHM in LR an HR, respectively. Deterioration of resolution at 8 cm radius were 0.6 and 0.8 in FWHM. Slice thicknesses were 12.8 and 9.1 mm FWHM at the center of FOV with LQ and HQ, respectively, its deviation being 1.1 and 0.8 mm over FOV with each, and 0.1 mm difference between direct and cross planes in LQ mode. Sensitivities, true events for Ga-68 20 cm diam cylinder, were 32(68), 17(33), 18 and 9 kcps/ (..mu..Ci/ml) with the direct (cross) planes of LRLQ, direct (cross) planes of HRLQ, direct planes of LRHQ and HRHQ, respectively. Count rates were declined 10% at 30 kcps true events per plane but recovered up to 100 kcps within 5% error by software correction using random coincidence events. Scattered fraction after corrected by subtracting a mean of outside the FOV in sinogram was 10 and 3% in the reconstructed images in LQ and HQ, respectively. Long term stability evaluated cross calibration factor checked weekly in the last half year was 1.9% COV as an average of 5 planes and 2.2% at maximum plane. These data imply that HEADTOME III permits an accurate analysis of tracer kinetics.

• Research Organization: Research Institute of Brain and Blood Vessels-AKITA, Akita
• OSTI ID: 7087721
• Report Number(s): CONF-840619-
• Conference Information: Journal Name: J. Nucl. Med.; (United States) Journal Volume: 25:5
• Country of Publication: United States
• Language: English

Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ACCURACY
BGO DETECTORS
BODY
BRAIN
CALIBRATION
CENTRAL NERVOUS SYSTEM
COMPUTER CODES
COMPUTERIZED TOMOGRAPHY
COUNTING RATES
DIAGNOSTIC TECHNIQUES
DIMENSIONS
EMISSION COMPUTED TOMOGRAPHY
IMAGES
ISOTOPE APPLICATIONS
MEASURING INSTRUMENTS
NERVOUS SYSTEM
ORGANS
POSITRON COMPUTED TOMOGRAPHY
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SENSITIVITY
SOLID SCINTILLATION DETECTORS
STABILITY
THICKNESS
TOMOGRAPHY
TRACER TECHNIQUES