DICOM Enhanced XA SOP Class Tim Becker Heinz

DICOM 国�会��研�会 二零零八年四月八日至十一日 中国成都 Enhanced XA SOP Class 的�用案例 Tim Becker Heinz Blendinger Bas Revet Francisco Sureda Rainer Thieme European Society of Cardiology Siemens Healthcare Philips Medical Systems GE Healthcare Siemens Healthcare (Chair DICOM WG-02) Working Group 02 – Projection Radiography and Angiography April 9, 2008 1

动画回放 FRAME ACQUISITION 1 2 3 4 5 Acq. Frame rate: 4. 0 Purpose: X-Ray control 6 7 8 9 10 11 12 13 Acq. Frame rate: 15. 0 Purpose: Contrast Media 14 15 16 17 18 19 Acq. Frame rate: 8. 0 Purpose: Contrast Media Frame Display Sequence (0018, 7022) DICOM ENCODING: XA/XRF Multi-frame Presentation Module April 9, 2008 Item 1 >Start Trim (0008, 2142) >Stop Trim (0008, 2143) >Skip Frame Range Flag (0008, 9460) >Recom. Disp Frame Rate (0008, 9459) =1 =5 = SKIP = 0. 0 Item 2 >Start Trim (0008, 2142) >Stop Trim (0008, 2143) >Skip Frame Range Flag (0008, 9460) >Recom. Disp Frame Rate (0008, 9459) =6 = 13 = DISPLAY = 15. 0 Item 3 >Start Trim (0008, 2142) >Stop Trim (0008, 2143) >Skip Frame Range Flag (0008, 9460) >Recom. Disp Frame Rate (0008, 9459) = 14 = 19 = DISPLAY = 8. 0 5

�像�示和�理 Shape = “IDENTITY” if (0028, 0004) = MONOCHROME 2 Shape = “INVERSE” if (0028, 0004) = MONOCHROME 1 X Modality LUT Stored Values VOI LUT Pixel Intensity Relationship LUT 1 to N Pixel Intensity Relationship LUT Sequence (0028, 9422) Pixel Intensity Relationship LUT April 9, 2008 Pixel Intensity Relationship LUT Sequence (0028, 9422) P LUT Pixel values transformed for specific application (if TO_LINEAR, then pixel values proportional to the X-ray beam intensity) Display Application “TO_LINEAR” is required if Pixel Intensity Relationship (0028, 1040) = LOG Pixel values transformed for specific application Application 7

复杂的像素相对位移 FRAME ACQUISITION and PROCESSING: Frames #1 #2 #3 April 9, 2008 Left Leg Right Leg Sub ID 100 Sub ID 101 DICOM ENCODING: Mask Module Mask Subtraction Sequence (0028, 6100) Item 1 >Mask Operation (0028, 6101) >Subtraction Item ID (0028, 9416) >Applicable Frame Range (0028, 6102) >Mask Frame Numbers (0028, 6110) >Mask Operation Expl. (0028, 6190) = AVG_SUB = 100 = 23 =1 = Left leg Item 2 >Mask Operation (0028, 6101) >Subtraction Item ID (0028, 9416) >Applicable Frame Range (0028, 6102) >Mask Frame Numbers (0028, 6110) >Mask Operation Expl. (0028, 6190) = AVG_SUB = 101 = 23 =1 = Right leg 9

复杂的像素相对位移 FRAME ACQUISITION and PROCESSING: Frames #1 #2 #3 Left Leg Right Leg mask Pixel Shift 0. 0 8. 0 Pixel Shift 1. 0 2. 0 1. 0 9. 0 April 9, 2008 DICOM ENCODING: Frame Pixel Shift Per-Frame Item 2 >Frame Pixel Shift Seq (0028, 9415) Frame #2 Item 1 >>Subtraction Item ID (0028, 9416) >>Mask Sub-pix Shift (0028, 6114) = 100 = 0. 0. 0 Item 2 >>Subtraction Item ID (0028, 9416) >>Mask Sub-pix Shift (0028, 6114) = 101 = 0. 08. 0 Item 3 >Frame Pixel Shift Seq (0028, 9415) Frame #3 Item 1 >>Subtraction Item ID (0028, 9416) >>Mask Sub-pix Shift (0028, 6114) = 100 = 1. 02. 0 Item 2 >>Subtraction Item ID (0028, 9416) >>Mask Sub-pix Shift (0028, 6114) = 101 = 1. 09. 010

投影像素尺寸校准 How to convert from “pixels on image” to “mm in patient”: #Px = Object size in “image” pixels D = Object size in mm #Px Isocenter TH = Table Height TO = Dist. Table to Object Beam Angle SID = Dist. Source-Detector ISO = Dist. Source-ISO DPx = Imager Pixel Spacing Beam Angle SID D ISO TH TO (0018, 1130) (0018, 9403) (0018, 9449) (0018, 1110) (0018, 9402) (0018, 1164) Table D = # Px * D Px * SOD / SID SOD = ISO - (TH- TO) / cos°(Beam Angle) April 9, 2008 X-Ray Source 12

�量 控制 Values per frame are in the Per-frame Functional Groups Seq. (200, 9230): In the Frame Content Sequence (0020, 9111): – Frame Acquisition Duration (0018, 9220) in ms of frame « i » = Dti In the Frame Acquisition Sequence (0018, 9417): – KVP (0018, 0060) of frame « i » – X-Ray Tube Current in m. A (0018, 9330) of frame « i » April 9, 2008 = k. Vpi = m. Ai 14

旋转运动 Frame #5: X-ray settings 5 Geometry settings 5 Frame #4: X-ray settings 4 Geometry settings 4 Frame #3: X-ray settings 3 Geometry settings 3 Optimized 3 D Reconstruction Frame #2: X-ray settings 2 Geometry settings 2 Frame #1: X-ray settings 1 Geometry settings 1 April 9, 2008 16

�象注册 Table run #2 Table run #1 +Z O +X +Z +Y O Positioner run #2 SID, ISO, FOV run #2 +Zp +X +Z +Y O +X +Yp +Xp +Y P 1 (x, y, z) April 9, 2008 P 1 t (xt, yt, zt) P 2 (x, y, z) P 2 p (xp, yp, zp) P 2(i, j) fa(P 1, Table 1) fb(P 1 t, Table 2) fc(P 2, Positioner 2) fd(P 2, SID, ISO, FOV) 17