|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | A review of patient dose and optimisation methods in adult and paediatric CT scanning显示文摘 | Dougeni E Fanlkner K Panayiotakis G | 2012 | Eur J Radiol2012，81，4： | 1 |
| 2 | A wavelet- based spatially adaptive method for mammographie contrast enhancement显示文摘 | Sakellaropoulos P Costaridou L Panayiotakis G | 2003 | Physics in Medicine and Biology2003，48，6： | 1 |
| 3 | Distance learning in mammographic digital image processing显示文摘 | Panayiotakis G Sakellaropoulos P | 1998 | The British Journal of Radiology1998，71，： | 1 |
| 4 | DOSIS:a Monte Carlo simulation program for dose related studies in mammography显示文摘 | Delis H Spyrou G Panayiotakis G | 2005 | Europ J Radiol (S0720-048X)2005，54，1： | 1 |
| 5 | A wavelet-based spa-tially adaptive method for mammographic contrast enhancement显示文摘 | Sakellaropoulos P Costaridou L Panayiotakis G | | 0，，： | 1 |
| 6 | Compression assessment based on medical image quality concepts using computer-generated test images显示文摘 | O. Kocsis L. Costaridou G. Mandellos D. Lymberopoulos G. Panayiotakis | 2002 | Computer Methods and Programs in Biomedicine2002，，2： | 1 |
| 7 | A wavelet-based spatially adaptive method for mammographic contrast enhancement显示文摘 | Sakellaropoulos P Costaridou L Panayiotakis G | 2003 | Physics in Medicine Biology2003，48，6： | 1 |
| 8 | Experimental determination of detector gain,zero frequency detective quantum efficiency and spectral compatibility of phosphor screens:comparison of CsI:Na and Gd2O2S:Tb for medical imaging applications显示文摘 | Kandarakis I Cavouras D Kanellopoulos E Panayiotakis G Nomicos C D | 1998 | Nuclear Instruments and Methods in Physics Research Section A:Accelerators Spectrometers Detectors and Associated Equipment1998，417，1： | 1 |
| 9 | Peripheral dose measurement in high-energy photon radiotherapy with the implementation of MOSFET显示文摘AIM:To study the peripheral dose(PD) from highenergy photon beams in radiotherapy using the metal oxide semiconductor field effect transistor(MOSFET) dose verification system.METHODS:The radiation dose absorbed by the MOSFET detector was calculated taking into account the manufacturer's Correction Factor,the Calibration Factor and the threshold voltage shift.PD measurements were carried out for three different field sizes(5 cm×5 cm,10 cm×10 cm and 15 cm×15 cm) and for various depths with the source to surface distance set at 100 cm.Dose measurements were realized on the central axis and then at distances(1 to 18 cm) parallel to the edge of the field,and were expressed as the percentage PD(% PD) with respect to the maximum dose(dmax).The accuracy of the results was evaluated with respect to a calibrated 0.3 cm3 ionization chamber.The reproducibility was expressed in terms of standard deviation(s) and coefficient of variation.RESULTS:% PD is higher near the phantom surface and drops to a minimum at the depth of dmax,and then tends to become constant with depth.Internal scatter radiation is the predominant source of PD and the depth dependence is determined by the attenuation of the primary photons.Closer to the field edge,where internal scatter from the phantom dominates,the % PD increases with depth because the ratio of the scatter to primary increases with depth.A few centimeters away from the field,where collimator scatter and leakage dominate,the % PD decreases with depth,due to attenuation by the water.The % PD decreases almost exponentially with the increase of distance from the field edge.The decrease of the % PD is more than 60% and can reach up to 90% as the measurement point departs from the edge of the field.For a given distance,the % PD is significantly higher for larger field sizes,due to the increase of the scattering volume.Finally,the measured PD obtained with MOSFET is higher than that obtained with an ionization chamber with percentage differences being from 0.6% to 34.0%.However,when normalized to the central dmax this difference is less than 1%.The MOSFET system,in the early stage of its life,has a dose measurement reproducibility of within 1.8%,2.7%,8.9% and 13.6% for 22.8,11.3,3.5 and 1.3 cGy dose assessments,respectively.In the late stage of MOSFET life the corresponding values change to 1.5%,4.8%,11.1% and 29.9% for 21.8,2.9,1.6 and 1.0 cGy,respectively.CONCLUSION: Comparative results acquired with the MOSFET and with an ionization chamber show fair agreement, supporting the suitability of this measurement for clinical in vivo dosimetry. | Vassiliki Vlachopoulou Georgia Malatara Harry Delis Kiki Theodorou Dimitrios Kardamakis George Panayiotakis | 2010 | World Journal of Radiology2010，2，11： | 1 |
| 10 | A review of patient dose and optimisation methods in aduh and paediatric CT scanning显示文摘 | Dougeni E Faulkner K Panayiotakis G | | 0，，： | 1 |
| 11 | A wavelet-based spatially adaptive method for mammographic contrast enhancement显示文摘 | Sakellaropoulos P Costaridou L Panayiotakis G | 2003 | Physics in Medicine Biology2003，48，6： | 1 |
| 12 | A review of patient dose and optimisation methods in adult and paediatric CT scanning 显示文摘 | Dougeni E Faulkner K Panayiotakis G | 2012 | Eur J Radiol2012，81，4： | 1 |
| 13 | Europi um-activated phosphors for use in X-ray detectors of medical imaging systems显示文摘 | Kandarakis I Cavouras D Panayiotakis G S | 1998 | Eur Radiology1998，8，2： | 1 |
| 14 | A review of patient dose and optimisation methods in adult and paediatric CT scanning显示文摘 | E. Dougeni K. Faulkner G. Panayiotakis | 2011 | European Journal of Radiology2011，，： | 1 |
| 15 | DOSIS: a Monte Carlo simulation program for dose related studies in mammography 显示文摘 | Delis H Spyrou G Panayiotakis G | 2005 | Europ J Radiol2005，54，1： | 1 |
| 16 | DOSIS:A Monte Carlo simulation program for dose related studies in mammography显示文摘 | Spyrou G Panayiotakis G | 2005 | Europ J Radiol2005，54，1： | 1 |
| 17 | A review of patient dose and optimisation methods in adult and paediatric CT scanning 显示文摘 | Dougeni E Faulkner K Panayiotakis G | 2012 | Eur J Radiol2012，81，： | 1 |
| 18 | DOSIS: a Monte Carlo simulation program fbr dose related studies in mammography 显示文摘 | DELLS H SPYROU G PANAYIOTAKIS G | 2005 | Europ J Radiol2005，54，： | 1 |
| 19 | A review of patient dose and optimisation methods in adult and paediatrie CT scanning 显示文摘 | Dougeni E Faulkner K Panayiotakis G | 2012 | Eur J Radial2012，81，4： | 1 |
| 20 | Europium-activated phosphors for use in X-ray detectors of medical imaging systems显示文摘 | I. Kandarakis D. Cavouras G. S. Panayiotakis D. Triantis C. D. Nomicos | 1998 | European Radiology1998，，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员