Volume 9, Issue 2 (lasers in medicine 2012)
lmj 2012, 9(2): 16-21 |
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Optimization of laser CT scanner for gel dosimetry, introducing a new optical design. lmj 2012; 9 (2) :16-21
URL: http://icml.ir/article-1-255-en.html
URL: http://icml.ir/article-1-255-en.html
Abstract: (10260 Views)
Background: In this study, it is proposed a new optical setup for optimizing laser CT scanner -which is used for tissue equivalent gel dosimetry.
Material & Methods: The procedure is based on using a laser diode as a light source and 3 consecutive optical setups to optimize the laser beam in order to reading tissue equivalent gel precisely. To date, magnetic resonance imaging (MRI) has been most extensively used for the evaluation of absorbed dose distributions in gel dosimeters. However, due to the practical problems of availability, cost and artifacts, optical scanning of gel has been used by several researchers as an accurate and practical alternative to MRI; the potential of optical CT method has been explored experimentally and the potential benefits are greatly desirable. Tomography by light is a non-destructive, fast, simple and cheap method in which the tissue equivalent gel is illuminated by light and the optical information is received by a CCD camera on the other side with respect to the rotation angle of the gel.
Results: The optical information is recorded and analyzed via a computer. Considering gel rotation degree and gathering the optical information from all 360o, a 3-dimensional contour is obtained by programming based on FBP (Filtered Back Projection) method. Images taken from each section are called "projection". Thus, increasing the number of projects in each distinct angle will enhance the precision.
Conclusion: The previous studies are lacking from attending to improve the light source and optical setup; the proposed optical setup in this paper shows improvements on output profile and consequently taken 3D images enhancing the accuracy.
Material & Methods: The procedure is based on using a laser diode as a light source and 3 consecutive optical setups to optimize the laser beam in order to reading tissue equivalent gel precisely. To date, magnetic resonance imaging (MRI) has been most extensively used for the evaluation of absorbed dose distributions in gel dosimeters. However, due to the practical problems of availability, cost and artifacts, optical scanning of gel has been used by several researchers as an accurate and practical alternative to MRI; the potential of optical CT method has been explored experimentally and the potential benefits are greatly desirable. Tomography by light is a non-destructive, fast, simple and cheap method in which the tissue equivalent gel is illuminated by light and the optical information is received by a CCD camera on the other side with respect to the rotation angle of the gel.
Results: The optical information is recorded and analyzed via a computer. Considering gel rotation degree and gathering the optical information from all 360o, a 3-dimensional contour is obtained by programming based on FBP (Filtered Back Projection) method. Images taken from each section are called "projection". Thus, increasing the number of projects in each distinct angle will enhance the precision.
Conclusion: The previous studies are lacking from attending to improve the light source and optical setup; the proposed optical setup in this paper shows improvements on output profile and consequently taken 3D images enhancing the accuracy.
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