SPECT imaging with the long bore collimator: Loss in sensitivity vs improved contrast resolution
A long bore (LB) collimator (16 cm thick) was compared with the standard low energy all purpose (LEAP) collimator for SPECT imaging. Line spread functions at various depths were measured in scatter material (planar imaging). Both collimators have similar full-width-at-half-maximum (FWHM) values yet the LB has less resolution loss with distance and consistently lower full-width-at-tenth-maximum (FWTM) values. An assessment of overall performance was made by planar imaging of the Rollo phantom with both collectors. Performance was judged by calculating the chi-square for the observed and expected contrasts of spherical cold targets (2.54, 1.91, 1.27 and 0.95 cm diameter). In all cases, LB scored consistently better than the LEAP. SPECT imaging of a bar phantom (spacing 2.25 cm) filled with I-123 (p,2n) confirmed the superior contrast resolution of the LB. Using SPECT data from 5 clinical I-123 IMP brain studies and from measurements of % rms noise as a function of total slice counts in a cylindrical phantom, the authors calculate that LB images would have a % rms noise of 8.7% compared to 5.7% for LEAP images acquired over the same time interval. The authors conclude that SPECT of the brain with the LB would lead to improved contrast resolution and a minimal increase in % rms noise despite a significant loss in sensitivity.
- Research Organization:
- Harvard Medical School, Boston, MA
- OSTI ID:
- 6931162
- Report Number(s):
- CONF-840619-; TRN: 87-008886
- Journal Information:
- J. Nucl. Med.; (United States), Vol. 25:5; Conference: 31. annual meeting of the Society of Nuclear Medicine, Los Angeles, CA, USA, 5 Jun 1984
- Country of Publication:
- United States
- Language:
- English
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COLLIMATORS
IMAGE PROCESSING
DEPTH
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PROTON REACTIONS
RESOLUTION
SENSITIVITY ANALYSIS
THICKNESS
TIME DEPENDENCE
BARYON REACTIONS
BARYONS
BODY
CENTRAL NERVOUS SYSTEM
CHARGED-PARTICLE REACTIONS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
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HADRONS
MOCKUP
NERVOUS SYSTEM
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
ORGANS
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STRUCTURAL MODELS
TESTING
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550602* - Medicine- External Radiation in Diagnostics- (1980-)