Correction of collimator aperture using a shift-variant deconvolution filter in gamma camera emission ct

Koichi Ogawa, Seungkuen Paek, Masato Nakajima, Shin’ichi Yuta, Atsushi Kubo, Shozo Hashimoto

研究成果: Article査読

16 被引用数 (Scopus)

抄録

We propose a new method which enables improved spatial resolution of a reconstructed image from a gamma camera emission CT(SPECT). SPECT images are blurred due to the effect of the collimator aperture. The blur effect changes with the geometrical structure of the collimator and with the distance between the rotational center of the gamma camera and the collimator surface. The acquired projection, affected by the collimator aperture, can be assumed to be the convolution of the ideal projection by the shift-variant blur functions. So the measured projection will be represented as a weighted summation of neighboring ideal projections of different angles and positions. From this standpoint, the blur function can be defined as a function of a common spatial frequency in the Fourier domain. Hence the deconvolution of the measured projection was circularly processed in the frequency domain. The effectiveness of the method was proven by simulations involving various aperture angles and the distances between the collimator surface and the rotational center.

本文言語English
ページ(範囲)699-706
ページ数8
ジャーナルProceedings of SPIE - The International Society for Optical Engineering
914
DOI
出版ステータスPublished - 1988 6 27
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

フィンガープリント

「Correction of collimator aperture using a shift-variant deconvolution filter in gamma camera emission ct」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル