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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN>I'm very (very) beginner in the manipulation of medical imageries. </span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN>I talk to you as specialists about the DTI issue.<br></span><span lang=EN-US>Thank you in advance for your patience and help.<br><br>I has a sequence taken with a DTI PHILIPS Achieva composed of a DICOMDIR and a list of files:<br>- 1541 DICOM files: IM0001 to IM1541 <br>- 2 files: XX_0181 and XX_1542<br>After analyzing the DICOM header:<br>- IM0001 to IM0180 files and XX0181 are standard MRI slices.<br>- IM0182 to IM1541 files and XX1542 are DWI slices.<br>- DWI slices are grouped by package 17 with the following values:<br>FILE|InstanceNumber|BValue|GradientOrientation<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0182|16|0|<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0183|17|800|-0.50, -0.50, -0.71<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0184|18|800|-0.50, -0.50, 0.71<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0185|19|800|0.71, -0.71, -0.00<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0186|20|800|-0.11, -0.71, -0.70<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0187|21|800|0.29, -0.70, -0.65<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0188|22|800|0.63, -0.33, -0.70<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0189|23|800|0.66, -0.27, -0.70<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0190|24|800|-0.67, -0.54, -0.50<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0191|25|800|0.70, -0.49, 0.51<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0192|26|800|-0.69, -0.25, 0.68<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0193|27|800|-0.71, -0.71, 0.03<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0194|28|800|-0.28, -0.71, 0.65<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0195|29|800|0.29, -0.70, 0.65<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0196|30|800|0.71, -0.71, 0.05<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0197|31|800|0.70, -0.20, 0.68<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>CD4 3D&DTI\DICOM\IM_0198|32|800|<o:p></o:p></span></p><p class=MsoNormal><span lang=EN><br><br></span><span lang=EN-US>My questions are:<br>1 - Why two files are named XX0181 and XX1542 instead of IM0181 and IM1542 and what did they in particular.<br>2 - DWI is grouped by package 17 it is the number of gradient? And is this number stored in a DICOM field?<br>3 - The image 0182 has a bValue equal to 0: Is it also a conventional MRI?<br>4 - The image 0198 has a bValue equal to 800 and no gradient, why?<br>5 - What are the other interesting DICOM fields for the treatment of DTI imaging?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></div></body></html>