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Smart dosimetry by pattern recognition using a single photon counting detector system in time over threshold mode

Reza, Salim, 1985- (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013),Mittuniversitet
Wong, Winnie (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
Fröjdh, Erik (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
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Norlin, Börje (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
Fröjdh, Christer (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
Thungstörm, Göran (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
Thim, Jan (author)
Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
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 (creator_code:org_t)
2012
2012
English.
In: Journal of Instrumentation. - 1748-0221. ; 7:1
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The function of a dosimeter is to determine the absorbed dose of radiation, for those cases in which, generally, the particular type of radiation is already known. Lately, a number of applications have emerged in which all kinds of radiation are absorbed and are sorted by pattern recognition, such as the Medipix2 application in [1]. This form of smart dosimetry enables measurements where not only the total dosage is measured, but also the contributions of different types of radiation impacting upon the detector surface. Furthermore, the use of a photon counting system, where the energy deposition can be measured in each individual pixel, ensures measurements with a high degree of accuracy in relation to the pattern recognition. In this article a Timepix [2] detector system has been used in the creation of a smart dosimeter for Alpha, Beta and Gamma radiation. When a radioactive particle hits the detector surface it generates charge clusters and those impacting upon the detector surface are read out and image processing algorithms are then used to classify each charge cluster. The individual clusters are calculated and as a result, the dosage for each type of radiation is given. In some cases, several particles can impact in roughly the same place, forming overlapping clusters. In order to handle this problem, a cluster separation method has been added to the pattern recognition algorithm. When the clusters have been separated, they are classified by shape and sorted into the correct type of radiation. The algorithms and methods used in this dosimeter have been developed so as to be simple and computationally effective, in order to enable implementation on a portable device. © 2012 IOP Publishing Ltd and SISSA.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Medicinteknik -- Medicinsk bildbehandling (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Medical Engineering -- Medical Image Processing (hsv//eng)
NATURVETENSKAP  -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)

Keyword

Dosimetry
Pattern Recognitionm
Single Photon Counting Detector
Time over Threshold Mode
Radiology
Nuclear Medicine and Medical Imaging
Radiologi och bildbehandling
Medical Image Processing
Medicinsk bildbehandling
Accelerator Physics and Instrumentation
Acceleratorfysik och instrumentering

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ref (subject category)
art (subject category)

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