Fourier coded aperture imaging in nuclear medicine

Chien Chou

doi:10.1117/12.939367

Fourier coded aperture imaging in nuclear medicine

Chien Chou

National Defense University Taiwan

Research output: Contribution to journal › Journal Article › peer-review

3 Scopus citations

Abstract

Fourier Aperture (FA) consists of two sinusoidal gratings in contact with each other. One possible mode of operation, both gratings are rotated about the same axis through equal angles in opposite directions. A clear difference moiré fringes is shown. The moiré frequency depends on the angle between two gratings. This aperture of moiré fringes is used as a variable frequency grating. It is able to scan the object spectrum in frequency domain. The summation filtered back projection algorithm with three different apodizing functions were introduced in the reconstruction. 99mT_c gamma ray source and 1" diameter Nal scintillation detector was used in the experiment. The thyroid phantom images show the spatial resolution of FA agree with the theoretical prediction. Three-D images capability is also discussed. The matrix inversion algorithm was used in the computer simulation of 3-D images. The depth resolution of FA is limited by the restricted view angle of the detector. Two plane objects with noise free in different depth were reconstructed.

Original language	English
Pages (from-to)	457-464
Number of pages	8
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	454
DOIs	https://doi.org/10.1117/12.939367
State	Published - 15 06 1984
Externally published	Yes

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title = "Fourier coded aperture imaging in nuclear medicine",

abstract = "Fourier Aperture (FA) consists of two sinusoidal gratings in contact with each other. One possible mode of operation, both gratings are rotated about the same axis through equal angles in opposite directions. A clear difference moir{\'e} fringes is shown. The moir{\'e} frequency depends on the angle between two gratings. This aperture of moir{\'e} fringes is used as a variable frequency grating. It is able to scan the object spectrum in frequency domain. The summation filtered back projection algorithm with three different apodizing functions were introduced in the reconstruction. 99mTc gamma ray source and 1{"} diameter Nal scintillation detector was used in the experiment. The thyroid phantom images show the spatial resolution of FA agree with the theoretical prediction. Three-D images capability is also discussed. The matrix inversion algorithm was used in the computer simulation of 3-D images. The depth resolution of FA is limited by the restricted view angle of the detector. Two plane objects with noise free in different depth were reconstructed.",

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N2 - Fourier Aperture (FA) consists of two sinusoidal gratings in contact with each other. One possible mode of operation, both gratings are rotated about the same axis through equal angles in opposite directions. A clear difference moiré fringes is shown. The moiré frequency depends on the angle between two gratings. This aperture of moiré fringes is used as a variable frequency grating. It is able to scan the object spectrum in frequency domain. The summation filtered back projection algorithm with three different apodizing functions were introduced in the reconstruction. 99mTc gamma ray source and 1" diameter Nal scintillation detector was used in the experiment. The thyroid phantom images show the spatial resolution of FA agree with the theoretical prediction. Three-D images capability is also discussed. The matrix inversion algorithm was used in the computer simulation of 3-D images. The depth resolution of FA is limited by the restricted view angle of the detector. Two plane objects with noise free in different depth were reconstructed.

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Fourier coded aperture imaging in nuclear medicine

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