Alignment of a volumetric tomography system

被引：22

作者：

Stevens, GM ^{[1
]}

Saunders, R

Pelc, NJ

机构：

[1] Stanford Univ, Dept Radiol, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[3] Gen Elect Med Syst, Waukesha, WI 53188 USA

来源：

MEDICAL PHYSICS | 2001年 / 28卷 / 07期

关键词：

volumetric tomography; tomosynthesis; system alignment; interpolation;

D O I：

10.1118/1.1382609

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

A test-bed system has been developed for imaging phantoms with tomosynthesis and volumetric computed tomography. This system incorporates an amorphous silicon flat panel detector on a movable gantry and a computer-controlled rotational positioning stage. In this paper, an analysis of the sensitivity of reconstructed images to geometrical misalignment is presented. Application of this method to circular digital tomosynthesis is examined, with spatial resolution in the focal plane as the criterion for evaluating the effect of misalignment. A software-based method is presented for correcting data for imperfect system alignment prior to image reconstruction. Experimental results yield reconstructed images with spatial resolution approaching the theoretical limit based on detector pixel size and accounting for data interpolation. (C) 2001 American Association of Physicists in Medicine.

引用

页码：1472 / 1481

页数：10

共 22 条

[1] Empirical investigation of the signal performance of a high-resolution, indirect detection, active matrix flat-panel imager (AMFPI) for fluoroscopic and radiographic operation [J].