An investigation of the performance of a coaxial HPGe detector operating in a magnetic resonance imaging field
An investigation of the performance of a coaxial HPGe detector operating in a magnetic resonance imaging field
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磁共振成像领域同轴 HPGe 探测器性能的研究
DOI：
10.1016/j.nima.2011.02.034
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Harkness L
中科院分区：
文献类型：
--
作者：
Harkness L
诸如正电子发射断层扫描和单光子发射计算机断层扫描的核医学成像模态用于通过检测从生物靶向放射性药物发射的伽马射线来探测身体的生理功能。医学成像界高度追求能够同时采集用于核医学成像和磁共振成像的数据的系统。这样的设备可以在明确定义的结构背景下提供对身体功能的更完整的医学见解。然而，由于大多数现有的闪烁体检测器系统采用传统的光电倍增管读出，获取同时的核/MRI序列在技术上具有挑战性。一个有前途的解决方案是由半导体探测器组成的核成像设备，可以与标准MRI扫描仪一起操作。然而，将诸如高纯度锗（HPGe）的半导体检测器放置在MRI扫描仪的膛内或靠近MRI扫描仪的膛放置（其中存在高磁场）的影响还没有被很好地理解。在本文中，HPGe探测器在高强度静态（BS）MRI场沿着快速切换梯度场和MRI系统射频中工作的性能已被评估。的BS场的能量分辨率的检测器上的影响已被调查的各种位置和方向的检测器内的磁场。然后解释的结果中的BS字段上的电荷收集性能的影响。MRI图像已与位于MRI孔的入口处的探测器一起采集，以研究同时数据采集对探测器性能和MRI成像的影响。
Nuclear medical imaging modalities such as positron emission tomography and single photon emission computed tomography are used to probe physiological functions of the body by detecting gamma rays emitted from biologically targeted radiopharmaceuticals. A system which is capable of simultaneous data acquisition for nuclear medical imaging and magnetic resonance imaging is highly sought after by the medical imaging community. Such a device could provide a more complete medical insight into the functions of the body within a well-defined structural context. However, acquiring simultaneous nuclear/MRI sequences are technically challenging due to the conventional photomultiplier tube readout employed by most existing scintillator detector systems. A promising solution is a nuclear imaging device composed of semiconductor detectors that can be operated with a standard MRI scanner. However, the influence of placing a semiconductor detector such as high purity germanium (HPGe) within or close to the bore of an MRI scanner, where high magnetic fields are present, is not well understood. In this paper, the performance of a HPGe detector operating in a high strength static (BS) MRI field along with fast switching gradient fields and radiofrequency from the MRI system has been assessed. The influence of the BSfield on the energy resolution of the detector has been investigated for various positions and orientations of the detector within the magnetic field. The results have then been interpreted in terms of the influence of the BSfield on the charge collection properties. MRI images have been acquired with the detector situated at the entrance of the MRI bore to investigate the effects of simultaneous data acquisition on detector performance and MRI imaging.
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