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Titolo:
IMPROVED ESTIMATION OF THE DETECTOR RESPONSE FUNCTION FOR CONVERGING BEAM COLLIMATORS
Autore:
FREY EC; TSUI BMW; GULLBERG GT;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN,152 MACNIDER HALL,CB 7575 CHAPEL HILL NC 27599 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 27599 UNIV UTAH,DEPT RADIOL,MED CTR AC213 SALT LAKE CITY UT 84132
Titolo Testata:
Physics in medicine and biology
fascicolo: 4, volume: 43, anno: 1998,
pagine: 941 - 950
SICI:
0031-9155(1998)43:4<941:IEOTDR>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEOMETRIC TRANSFER-FUNCTION; SPECT; ATTENUATION; IMPLEMENTATION; RESOLUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
7
Recensione:
Indirizzi per estratti:
Citazione:
E.C. Frey et al., "IMPROVED ESTIMATION OF THE DETECTOR RESPONSE FUNCTION FOR CONVERGING BEAM COLLIMATORS", Physics in medicine and biology, 43(4), 1998, pp. 941-950

Abstract

Converging beam collimator geometries offer improved tradeoffs between resolution and noise for single photon emission computed tomography (SPECT). The major factor limiting the resolution in SPECT is the collimator-detector response blurring. In order to compensate for this blurring it is useful to be able to calculate the collimator response function. A previous formulation presented a method for calculating the response for parallel and converging beam collimators that assumed thatthe shape of the holes did not change over the face of the collimator. However, cast collimators are fabricated using pins with a constant cross-section (shape perpendicular to the pin axis). As a result, due to the angulation of the pins, the holes made by these pins have shapes on the front and back faces of the collimator that change with position. This change in hole shape is especially pronounced when the anglebetween the collimator hole and the collimator normal is large, as isthe case for half-fan-beam or short-focal-length collimators. This paper presents a derivation of a modification to the original method that accounts for the change in shape of the collimator holes. The methodhas been verified by comparing predicted line spread functions to experimentally measured ones for a collimator with a maximum hole angle of 35 degrees with respect to the normal. This formulation is useful for predicting the response of fan-beam collimators in the design process and for use in detector response compensation algorithms.

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Documento generato il 22/01/20 alle ore 21:42:08