Laser alignment system for helical pinhole SPECT

Author

Metzler, S.D. ; Greer, K.L. ; Jaszczak, R.J.

Author_Institution

Dept. of Radiol., Duke Univ. Med. Center, Durham, NC, USA

Volume

3

fYear

2003

fDate

19-25 Oct. 2003

Firstpage

1860

Abstract

Pinhole SPECT is very sensitive to mechanical alignment because it is a magnifying geometry. Because of magnification, small mechanical shifts of the aperture result in a large change in the projection data. Helical orbits may be used for pinhole SPECT to improve the completeness of the projection data. This has been done by using a research scanner to provide rotation while a linear stage produces axial movement. The combined effect is a helical orbit. However, reconstruction quality may be limited by the alignment of the linear stage with the axis of rotation of the scanner. We have developed a laser system for aligning the linear stage. We present the system design and estimate the accuracy of its alignment Experimental helical pinhole SPECT data are presented.

Keywords

image reconstruction; image scanners; laser applications in medicine; medical image processing; single photon emission computed tomography; helical pinhole SPECT; laser alignment system; linear stage; magnification; reconstruction quality; research scanner; Apertures; Biomedical engineering; Biomedical imaging; Calibration; Detectors; Geometrical optics; Imaging phantoms; Optical collimators; Orbits; Radiology;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2003 IEEE

ISSN

1082-3654

Print_ISBN

0-7803-8257-9

Type

conf

DOI

10.1109/NSSMIC.2003.1352241

Filename

1352241