Author/Authors :
Iseki، نويسنده , , Yasushi and Mizuno، نويسنده , , Hideyuki and Futami، نويسنده , , Yasuyuki and Tomitani، نويسنده , , Takehiro and Kanai، نويسنده , , Tatsuaki and Kanazawa، نويسنده , , Mitsutaka and Kitagawa، نويسنده , , Atsushi and Murakami، نويسنده , , Takeshi and Nishio، نويسنده , , Teiji and Suda، نويسنده , , Mitsuru and Urakabe، نويسنده , , Eriko and Yunoki، نويسنده , , Akira and Sakai، نويسنده , , Hir، نويسنده ,
Abstract :
A positron camera, consisting of a pair of Anger-type scintillation detectors, has been developed to verify ranges by using positron emitter beams. Each detector head is equipped with a NaI(Tl) crystal (diameter: 600 mm, thickness: 30 mm) for high detection efficiency. To get a low counting rate for this application, the electric circuit was designed for flexibility in measurement and analysis by software. The energy and position were calibrated for high measurement accuracy. A spatial resolution of 8.6 mm in FWHM within a ±50 mm region (field of view) and a linear response of a 0.3 mm standard deviation within a ±200 mm region were obtained. The camera was designed so as to measure the ranges within an accuracy of 1 mm under a dose limitation (about 100 mGyE) to reduce the safety margin for the irradiation field, and it met the required characteristics.
Keywords :
Positron emitter , Positron camera , Spatial resolution , HIMAC , radiotherapy , heavy ion
