Thallium bromide (TlBr) is a promising semiconductor detector material for positron emission tomography (PET) because it can offer very good energy resolution and 3-D segmentation capabilities, and it also provides detection efficiency surpassing that of commonly used scintillators. Energy, timing, and spatial resolution were measured for thin (<1 mm) TlBr detectors. The energy and timing resolution were measured simultaneously for the same planar 0.87 mm-thick TlBr device. An energy resolution of (6.4±1.3)% at 511 keV was achieved at −400 V bias voltage and at room temperature. A timing resolution of (27.8±4.1) ns FWHM was achieved for the same operating conditions when appropriate energy gating was applied. The intrinsic spatial resolution was measured to be 0.9 mm FWHM for a TlBr detector with metallic strip contacts of 0.5 mm pitch. As material properties improve, higher bias voltage should improve timing performance. A stack of thin detectors with finely segmented readout can create a modular detector with excellent energy and spatial resolution for PET applications.
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机译：溴化（（TlBr）是一种有前途的正电子发射断层扫描（PET）半导体检测器材料，因为它可以提供非常好的能量分辨率和3-D分割功能，并且其检测效率也超过了常用的闪烁体。测量了薄型（<1 mm）TlBr检测器的能量，时间和空间分辨率。对于同一个0.87 mm厚的平面TlBr器件，同时测量了能量和时序分辨率。在-400 V偏置电压和室温下，在511 keV下实现了（6.4±1.3）％的能量分辨率。当应用适当的能量门控时，对于相同的工作条件，实现了（27.8±4.1）ns FWHM的定时分辨率。对于具有0.5mm间距的金属条触点的TlBr检测器，固有空间分辨率测得为0.9 mm FWHM。随着材料性能的提高，较高的偏置电压将改善时序性能。带有细段读数的一堆薄检测器可以为PET应用创建具有出色能量和空间分辨率的模块化检测器。
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