Performance of simultaneous emission-transmission systems for attenuation-corrected SPECT: a method for validation applied to two camera systems
Performance of simultaneous emission-transmission systems for attenuation-corrected SPECT: a method for validation applied to two camera systems
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衰减校正 SPECT 同步发射传输系统的性能：应用于两个相机系统的验证方法
DOI：
10.1097/00006231-200107000-00006
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发表时间：
2001
影响因子：
1.5
通讯作者：
P. Wollmer
中科院分区：
文献类型：
--
作者：
H. Almquist;K. Norrgren;J. Palmer;B. Jonson;P. Wollmer
几种商用的基于透射扫描的单光子发射计算机断层扫描（SPECT）衰减校正系统在性能上有所不同。描述了SPECT中衰减校正的测试程序，并将其应用于两种主要不同的伽马相机系统（西门子Multispect 3三头系统[3HS]和ADAC Genesys Vertex双头系统[2HS]）。测试过程是基于几何上定义良好的幻影。用躯干幻像来说明衰减校正方法。测试程序可以在不详细了解或访问用于衰减校正的算法的情况下使用。2HS对幻影中放射性透射测量的影响高于3HS。3HS产生了令人满意的衰减图，并将发射计数率修正为与幻体密度和尺寸无关的恒定值。在2HS中，随着幻体密度的增加，发射计数校正率逐渐降低，与小幻体相比，大幻体的校正计数率降低约30%。在发射源附近测量到的衰减系数的减少在大而不是小的幻像中得到了证明。一个可能的解释是对传输能量窗口的向下散射进行了错误的修正。本研究证明了SPECT中衰减校正系统独立评估的必要性。
Several commercially available systems for attenuation correction in single photon emission computed tomography (SPECT) based on a transmission scan have been introduced that vary in performance. A test procedure for attenuation correction in SPECT is described and applied to two principally different gamma camera systems (the Siemens Multispect 3 triple-headed system [3HS] and the ADAC Genesys Vertex double-headed system [2HS]). The test procedure was based on geometrically well-defined phantoms. A torso phantom was used to illustrate the attenuation correction methods. The test procedure can be used without detailed knowledge of or access to the algorithms used for attenuation correction. The influence on the transmission measurement of radioactivity in a phantom was higher for the 2HS than for the 3HS. The 3HS produced satisfactory attenuation maps and corrected emission count rates to a constant value independent of phantom density and size. With the 2HS, there was a progressive decrease in the correction of emission count rates with increasing phantom density, and about 30% lower corrected count rates in the large compared with the small phantom. A decrease in measured attenuation coefficients in the vicinity of an emission source was demonstrated in large but not small phantoms. A likely explanation is erroneous correction of downscatter into the transmission energy window. This study demonstrates the need for independent evaluation of systems for attenuation correction in SPECT.
比较镅 241 和锝 99m 作为心脏铊 201 SPECT 成像衰减校正的传输源。
DOI：
--
发表时间：
1994
期刊：
Journal of nuclear medicine : official publication, Society of Nuclear Medicine
影响因子：
--
作者：
Ficaro,EP;Fessler,JA;Rogers,WL;Schwaiger,M
通讯作者：
Schwaiger,M