Presentation Development of the helmet-neck PET prototype: comparison with the helmet-chin PET

田島, 英朗  ,  吉田, 英治  ,  岩男, 悠真  ,  脇坂, 秀克  ,  前田, 貴雅  ,  高堂, 裕平  ,  関, 千江  ,  樋口, 真人  ,  須原, 哲也  ,  山下, 大地  ,  山谷, 泰賀

We are developing the helmet PET in which detectors are arranged on a hemisphere with an add-on detector for high sensitivity brain imaging. We have developed the helmet-chin PET prototype having the add-on detector at the chin position to improve the sensitivity. However, the add-on detector at the chin position gave an oppressive feeling to the patient, and the moving part of the add-on detector was not convenient for the patient setup. On the other hand, our previous simulation has shown that the add-on detector covering the neck position has an equivalent effect for improving the sensitivity and imaging quality. In this study, therefore, we developed a helmet-neck PET prototype, which has the add-on detector at the neck position, by remodeling our first helmet-chin PET prototype. The prototype has 54 4-layer depth-of-interaction detectors each of which consists of 16x16x4 array of 2.8×2.8×7.5 mm3 Zr-doped GSO scintillators and a 64-ch position sensitivity photomultiplier tube. We measured sensitivity with a hemispherical pool phantom for the brain region, and we found that the add-on detector at the neck position was more effective for improving the sensitivity for the region than that at the chin position. This was because the arrangement of the detector at the chin position requires a larger margin for designing the gantry, in which the detector position becomes farther away than in the case of the neck position. We conducted a healthy volunteer study using the helmet-neck PET prototype. The result showed that the helmet-neck PET has promising performance for high sensitivity brain imaging and improved convenience for patient studies.
2017 IEEE Nuclear Science Symposium & Medical Imaging Conference

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