en Medical Physics Medical Physics تحقيق بديع Original Research  <p class="MsoBodyText2" style="DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: center mso-pagination: widow-orphan"><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN">ABSTRACT</span><span style="FONT-WEIGHT: bold FONT-FAMILY: "></span></p><p class="MsoBodyText2" style="TEXT-JUSTIFY: newspaper TEXT-KASHIDA-SPACE: 50% DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: justify mso-pagination: widow-orphan" align="center"><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN"></span><span style="FONT-WEIGHT: bold FONT-FAMILY: "></span></p><p></p><p class="MsoBodyText2" style="TEXT-JUSTIFY: newspaper TEXT-KASHIDA-SPACE: 50% DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: justify mso-pagination: widow-orphan"><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN">Background: </span><span style="language: EN mso-ansi-language: EN">Monte Carlo simulation has been used by many researchers to calculate organ and effective dose of patients arising from conventional X-ray examinations. In this study the radiation transport code, MCNP-4C, has been used to perform Monte Carlo simulations to estimate radiation dose delivered to different organs in conventional X-ray examinations.</span><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN"></span></p><p></p><p class="MsoBodyText2" style="TEXT-JUSTIFY: newspaper TEXT-KASHIDA-SPACE: 50% DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: justify mso-pagination: widow-orphan"><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN">Material and Methods: </span><span style="language: EN mso-ansi-language: EN">In this work we have made use of ORNL mathematical phantoms with few modifications which have been made. The source has been defined as a point source, emitting photons into a solid angle. The X-ray beam was shaped by a collimator to produce a rectangular field at the midline of the phantom. </span><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN"></span></p><p></p><p class="MsoBodyText2" style="TEXT-JUSTIFY: newspaper TEXT-KASHIDA-SPACE: 50% DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: justify mso-pagination: widow-orphan"><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN">Results: </span><span style="language: EN mso-ansi-language: EN">To validate the simulation executed in this study normalized organs doses to unit ESD for hermaphrodite phantom were computed. Our results were compared with corresponding values presented by NRPB. In general organs doses obtained by application of MCNP-4C (present study) and corresponding values presented in NRPB were in good agreement. For further evaluation of our phantom, the values acquired for organ and effective doses by MCNP-4C and ODS-60 were compared. </span><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN"></span></p><p></p><p class="MsoNormal" style="TEXT-JUSTIFY: newspaper TEXT-KASHIDA-SPACE: 50% DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: justify mso-pagination: none"><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN">Conclusion: </span><span style="language: EN mso-ansi-language: EN">The technique we have developed is capable of estimating organ and effective doses with a better accuracy than dose values obtained by employment of NRPB and ODS-60 technique.</span><span style="FONT-WEIGHT: bold language: EN mso-ansi-language: EN"></span></p><p></p><p class="MsoNormal" style="mso-pagination: none"><span dir="ltr" style="DIRECTION: ltr FONT-FAMILY: "> </span></p><p></p><p></p><p class="MsoBodyText2" style="DIRECTION: ltr LINE-HEIGHT: 150% unicode-bidi: embed TEXT-ALIGN: center mso-pagination: widow-orphan"><span style="FONT-WEIGHT: bold FONT-FAMILY: "></span></p><p></p><p class="MsoNormal" style="mso-pagination: none"><span dir="ltr" style="DIRECTION: ltr FONT-FAMILY: "></span></p><p></p> ,Organ dose,effective dose,diagnostic radiology,Monte Carlo,MCNP-4C 21 30 http://ijrr.com/browse.php?a_code=A-10-1-120&slc_lang=en&sid=1 M.T. Bahreyni Toossi m-t-bahreyni@mums.ac.ir 79003194753284600337 79003194753284600337 Yes H. Zare 79003194753284600338 79003194753284600338 No