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DETERMINATION OF BIOLOGICAL TISSUE PARAMETERS FROM LINEAR ATTENUATION COEFFICIENT MEASUREMENTS

, 2014
The possibility to classify pathological tissues – for example tumor neo-angiogenesis pattern-, using new X-ray imaging technique (such as Quasi-Monochromatic Multi-Energy X-ray Imaging) is strictly related to an accurate knowledge of their X-ray absorption coefficients μ(E).
ROSSI, PIER LUCA, MASETTI, SIMONE, LANCONELLI, NICO, BIANCHINI, DAVID, CORAZZA, IVAN, LOMBI, ALESSANDRO, ZANNOLI, ROMANO, BALDAZZI, GIUSEPPE   +7 more
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Photon linear attenuation coefficients and water content of normal and pathological breast tissues

Applied Radiation and Isotopes, 1996
Normal and pathological breast tissue samples were scanned using a Photon Transmission Tomography (PTT) technique in order to determine their averaged photon linear attenuation coefficients (mu). Subsequent to being freeze-dried the samples were examined, using a high purity germanium detector (HPGe) and the gamma-rays of energy 59.5 keV from an ...
J S, al-Bahri, N M, Spyrou
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New method for the determination of the linear attenuation coefficient of γ rays in matter

AIP Conference Proceedings, 2019
In our previous participations to the Panhellenic Physics Conference (PPC) we refer to detailed and accurate measurements of 60Co γ-ray attenuation in various absorbers, that our team has performed, and their meaning as well. In the present article we extended these measurements in even more absorbers which already cover a wide range of atomic number ...
E. Adamides, A. Kavadjiklis, S. K. Koutroubas, P. Koutroubas, N. Moshonas   +4 more
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Near K-edge linear attenuation coefficients for Si, SiO2 and Si3N4

Radiation Physics and Chemistry, 2002
Abstract We present tabulated near K-edge linear attenuation coefficients for a range of materials commonly used in MOS construction; namely, crystalline silicon (Si-c), amorphous silicon (Si-a), amorphous silicon dioxide (SiO 2 -a) and amorphous silicon nitride (Si 3 N 4 -a).
Alan Owens, G.W Fraser, S.J Gurman
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The Theoretical Linear Attenuation and Scattering Coefficients of Polymethyl Methacrylate

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences
Polymethyl methacrylate (PMMA, C5H8O2) is widely used as a human breast tissue equivalent in medical X-ray technology. PMMA is preferred for reference and dosimetry measurements due to the resemblance in breast tissue’s attenuation and scattering characteristics.
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The linear attenuation coefficients as features of multiple energy CT image classification

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2000
Abstract We present in this paper an analysis of the linear attenuation coefficients as useful features of single and multiple energy CT images with the use of statistical pattern classification tools. We analyzed four CT images through two pointwise classifiers (the first classifier is based on the maximum-likelihood criterion and the second ...
M.R.P Homem, N.D.A Mascarenhas, P.E Cruvinel   +2 more
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Improvements in the two media method for measurements of gamma-ray linear attenuation coefficients

Applied Radiation and Isotopes, 2003
The two media method has been previously presented as a solution to the problem of measuring gamma-ray attenuation coefficients of odd-shaped samples. We propose that air is chosen as one of the two media. We theoretically demonstrate that this choice simplifies the equation used, as well as the laboratory work, and also reduces some of the terms ...
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Derivation of linear attenuation coefficients from CT numbers for low-energy photons

Physics in Medicine and Biology, 1999
One can estimate photon attenuation properties from the CT number. In a standard method one assumes that the linear attenuation coefficient is proportional to electron density and ignores its nonlinear dependence on atomic number. When the photon energy is lower than about 50 keV, such as for brachytherapy applications, however, photoelectric ...
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Accuracy of linear attenuation coefficients measured with a photon counting CT system

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), 2012
The purpose of our research is to develop a photon counting CT system with a semiconductor detector. The photon counting CT system enables us to decompose materials, and this information is useful to diagnose diseases. We developed a new CdTe detector that was able to measure x-rays with the count rate of 107 counts/sec/mm2 with four energy windows ...
Toru Kobayashi, Koichi Ogawa, Futoshi Kaibuki, Tsutomu Yamakawa, Tatsuya Nagano, Daisuke Hashimoto   +5 more
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Measurement of mass attenuation coefficients in air by application of detector linearity tests

Physical Review A, 2002
Accurate knowledge of x-ray mass attenuation coefficients is essential for studies as diverse as atomic physics, materials science, and radiation safety. However, a significant discrepancy exists between theoretical tabulated results for air at soft x-ray energies.
A. G. Peele, C. T. Chantler, D. Paterson, P. J. McMahon, T. H. K. Irving, J. J. A. Lin, K. A. Nugent, A. N. Brunton, I. McNulty   +8 more
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