dorsal/arxiv
View SchemaDepth of Interaction Enhanced Gamma-Ray Imaging for Medical Applications
| Authors | Christoph W. Lerche |
|---|---|
| Categories | |
| ArXiv ID | physics/0611011 |
| URL | https://arxiv.org/abs/physics/0611011 |
Abstract
A novel design for an inexpensive depth of interaction capable detector for gamma rays, suitable for nuclear medical applications, especially Positron Emission Tomography, has been developed. The design takes advantage of the strong correlation between the width of the scintillation light distribution in continuous crystals and the depth of interaction of the gamma-ray. For measuring the distribution width, an inexpensive modification of the commonly used charge dividing circuits that allows analogue and instantaneous computation of the 2nd moment has been developed and is presented in this work. The method has been tested with a detector made of a continuous LSO-scintillator of dimensions 42x42x10 cubic mm and optically coupled to the compact large area position sensitive photomultiplier H8500 from Hamamatsu. The mean resolution in all non-trivial moments was found to be smaller than 5% but their direct use as estimates for the three-dimensional photoconversion position turned out to be unsuitable. Standard polynomial interpolation in higher dimensions has been adopted to reconstruct the impact positions of the gamma-rays from the measured moments. When using the reconstructed impact positions, the intrinsic mean spatial resolution of the detector was found to be 1.9 mm for the transverse components and 3.9 mm for the depth of interaction. Using directly the bare moments as position estimate, the intrinsic mean spatial resolution of the detector was found to be 3.4 mm and 4.9 mm, respectively. The cost for the required detector improvements are essentially negligible.
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"abstract": "A novel design for an inexpensive depth of interaction capable detector for\ngamma rays, suitable for nuclear medical applications, especially Positron\nEmission Tomography, has been developed. The design takes advantage of the\nstrong correlation between the width of the scintillation light distribution in\ncontinuous crystals and the depth of interaction of the gamma-ray. For\nmeasuring the distribution width, an inexpensive modification of the commonly\nused charge dividing circuits that allows analogue and instantaneous\ncomputation of the 2nd moment has been developed and is presented in this work.\nThe method has been tested with a detector made of a continuous\nLSO-scintillator of dimensions 42x42x10 cubic mm and optically coupled to the\ncompact large area position sensitive photomultiplier H8500 from Hamamatsu. The\nmean resolution in all non-trivial moments was found to be smaller than 5% but\ntheir direct use as estimates for the three-dimensional photoconversion\nposition turned out to be unsuitable. Standard polynomial interpolation in\nhigher dimensions has been adopted to reconstruct the impact positions of the\ngamma-rays from the measured moments. When using the reconstructed impact\npositions, the intrinsic mean spatial resolution of the detector was found to\nbe 1.9 mm for the transverse components and 3.9 mm for the depth of\ninteraction. Using directly the bare moments as position estimate, the\nintrinsic mean spatial resolution of the detector was found to be 3.4 mm and\n4.9 mm, respectively. The cost for the required detector improvements are\nessentially negligible.",
"arxiv_id": "physics/0611011",
"authors": [
"Christoph W. Lerche"
],
"categories": [
"physics.med-ph",
"nucl-ex",
"physics.ins-det"
],
"title": "Depth of Interaction Enhanced Gamma-Ray Imaging for Medical Applications",
"url": "https://arxiv.org/abs/physics/0611011"
},
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