### Abstract

This study investigated the use of half-fanbeam collimation with a 90° dual-detector system for myocardial SPECT imaging. The detection efficiency as a function of focal length was evaluated to determine if an optimal focal length exists. Second, sinograms were constructed and a simulation study was performed to determine if there is an optimal camera rotation which maximizes the total acquired myocardial counts while providing sufficient angular sampling for the myocardial region. Finally, image artifacts for various camera rotations were evaluated using simulated and experimental data. There exists an optimal collimator focal length for a given ROR; it varies with ROR. Relative to parallel collimation, the detection efficiency for half-fanbeam collimation is roughly 20% greater, for the same spatial resolution. The theoretical minimum camera rotation for complete sampling of the myocardial region ranges from 123° to 145° for RORs ranging from 13 to 25 cm, respectively. The total number of acquired myocardial counts is relatively constant for camera rotations of 135° to 360°. Myocardial SPECT images reconstructed iteratively with attenuation compensation from half-fanbeam data collected over camera rotations ranging from 135° to 360° showed no artifacts in the myocardial region. We conclude that a camera rotation of 180° centered at 45° left anterior oblique is a good, practical minimum rotation. Half-fanbeam collimation is a strong alternative system configuration for myocardial SPECT.

Original language | English (US) |
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Title of host publication | IEEE Nuclear Science Symposium and Medical Imaging Conference |

Publisher | IEEE |

Pages | 1189-1193 |

Number of pages | 5 |

Volume | 2 |

ISBN (Print) | 0780350227 |

State | Published - 1999 |

Externally published | Yes |

Event | Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record - Toronto, Que, Can Duration: Nov 8 1998 → Nov 14 1998 |

### Other

Other | Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record |
---|---|

City | Toronto, Que, Can |

Period | 11/8/98 → 11/14/98 |

### Fingerprint

### ASJC Scopus subject areas

- Computer Vision and Pattern Recognition
- Industrial and Manufacturing Engineering

### Cite this

*IEEE Nuclear Science Symposium and Medical Imaging Conference*(Vol. 2, pp. 1189-1193). IEEE.

**Investigation of 90° dual-detector half-fanbeam collimation for myocardial SPECT imaging.** / LaCroix, Karen J.; Tsui, Benjamin.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*IEEE Nuclear Science Symposium and Medical Imaging Conference.*vol. 2, IEEE, pp. 1189-1193, Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record, Toronto, Que, Can, 11/8/98.

}

TY - CHAP

T1 - Investigation of 90° dual-detector half-fanbeam collimation for myocardial SPECT imaging

AU - LaCroix, Karen J.

AU - Tsui, Benjamin

PY - 1999

Y1 - 1999

N2 - This study investigated the use of half-fanbeam collimation with a 90° dual-detector system for myocardial SPECT imaging. The detection efficiency as a function of focal length was evaluated to determine if an optimal focal length exists. Second, sinograms were constructed and a simulation study was performed to determine if there is an optimal camera rotation which maximizes the total acquired myocardial counts while providing sufficient angular sampling for the myocardial region. Finally, image artifacts for various camera rotations were evaluated using simulated and experimental data. There exists an optimal collimator focal length for a given ROR; it varies with ROR. Relative to parallel collimation, the detection efficiency for half-fanbeam collimation is roughly 20% greater, for the same spatial resolution. The theoretical minimum camera rotation for complete sampling of the myocardial region ranges from 123° to 145° for RORs ranging from 13 to 25 cm, respectively. The total number of acquired myocardial counts is relatively constant for camera rotations of 135° to 360°. Myocardial SPECT images reconstructed iteratively with attenuation compensation from half-fanbeam data collected over camera rotations ranging from 135° to 360° showed no artifacts in the myocardial region. We conclude that a camera rotation of 180° centered at 45° left anterior oblique is a good, practical minimum rotation. Half-fanbeam collimation is a strong alternative system configuration for myocardial SPECT.

AB - This study investigated the use of half-fanbeam collimation with a 90° dual-detector system for myocardial SPECT imaging. The detection efficiency as a function of focal length was evaluated to determine if an optimal focal length exists. Second, sinograms were constructed and a simulation study was performed to determine if there is an optimal camera rotation which maximizes the total acquired myocardial counts while providing sufficient angular sampling for the myocardial region. Finally, image artifacts for various camera rotations were evaluated using simulated and experimental data. There exists an optimal collimator focal length for a given ROR; it varies with ROR. Relative to parallel collimation, the detection efficiency for half-fanbeam collimation is roughly 20% greater, for the same spatial resolution. The theoretical minimum camera rotation for complete sampling of the myocardial region ranges from 123° to 145° for RORs ranging from 13 to 25 cm, respectively. The total number of acquired myocardial counts is relatively constant for camera rotations of 135° to 360°. Myocardial SPECT images reconstructed iteratively with attenuation compensation from half-fanbeam data collected over camera rotations ranging from 135° to 360° showed no artifacts in the myocardial region. We conclude that a camera rotation of 180° centered at 45° left anterior oblique is a good, practical minimum rotation. Half-fanbeam collimation is a strong alternative system configuration for myocardial SPECT.

UR - http://www.scopus.com/inward/record.url?scp=0032596186&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032596186&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:0032596186

SN - 0780350227

VL - 2

SP - 1189

EP - 1193

BT - IEEE Nuclear Science Symposium and Medical Imaging Conference

PB - IEEE

ER -