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Myocardial Display Mike Avison Bradford. Team Work Physicist - test design and tools Technologist - test execution Physician - Accurate reporting.

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Presentation on theme: "Myocardial Display Mike Avison Bradford. Team Work Physicist - test design and tools Technologist - test execution Physician - Accurate reporting."— Presentation transcript:

1 Myocardial Display Mike Avison Bradford

2 Team Work Physicist - test design and tools Technologist - test execution Physician - Accurate reporting

3 What’s Wrong? With Beacon Factory Processing Views for reformatting are too small for accurate slice placement Operator must remember angles and slice placement too long (sequential stress-rest processing) No colour scale No size information

4 Taking the easy way I did think of modifying the factory tcl script –for about 6 seconds Instead we quit the tcl just before reformatting This provides us with attenuation corrected and uncorrected T files for Stress and Rest (T files are transaxial)

5 What Next? Select the Stress files on workbench Select the Rest files on a second workbench Run the same small WB macro on each –In parallel (no need to remember angles and slices) –Does a fixed offset translate (-12,18) of images to put the heart approx centre (work round for reformat bug) –Sets up reformatting to 64x64 matrix with 3mm pixel size

6 Why 3mm? Makes slices thin –we can add slices in display macro later –it makes the planning images bigger so the operator can prescribe more accurately

7 Display Macro Allows slice summing Hence allows small realignments (ie ¼ slice) Displays annotated colour stripe Better truncation Annotated with –Slice thickness –Cell dimension –Regardless of acquisition, reformatting, zoom etc

8 How long did it take? About 10 minutes to “learn” the basics 2 hours to edit in the menus etc 2 weeks to polish, debug, validate….

9 Simplified Elements Display summed slices, record operator alignments show \ mode="Hex" fnum="0-5" matrix_size="128" cell="I1" \ cell_border="default" image_border="none" labels="Both" \ numbering="Yes" statistics="None" upv="File relative" \ truncation="None" ref_image="Single" stripe_ref="Same" zoom_factor="'zoom'" \ zoom_centers="" image_step="'SliceSum' sum 'sliceSum'" \ sim_groups="" Info_format="default" \ alignment= "Interactive:'a1'" alignment2="Interactive:'a2'" \ alignment3="Interactive:'a3'” alignment4="Interactive:'a4'" \ alignment5="Interactive:'a5'" alignment6="Interactive:'a6'" \ alignment7="beginning" alignment8="beginning" color_stripe="A" \ color_stripe2="A" color_stripe3="A" color_stripe4="A" \ color_stripe5="A" color_stripe6="A" color_stripe7="A" \ color_stripe8="A".;.; capture the alignments and zoom factors as defined by the operator.;.set zoom $show_zoom_factor.set a1 $show_lo_1.set a2 $show_lo_2.set a3 $show_lo_3.set a4 $show_lo_4.set a5 $show_lo_5.set a6 $show_lo_6

10 Simplified Elements Truncate all 3 series separately record values.set l #0.for n = #0.to #4.step #2.inc l show \ mode="Single" fnum="'n'" matrix_size="128" cell="I'l'" \ cell_border="default" image_border="none" labels="Both" \ numbering="Yes" statistics="None" upv="Pixie relative" \ truncation="100%" ref_image="Single" stripe_ref="Same" zoom_factor="'zoom'" \ zoom_centers="" image_step="'SliceSum' sum 'sliceSum'" sim_groups="" Info_format="default" \ alignment= "Interactive" alignment2="Interactive" alignment3="Interactive" \ alignment4="Interactive" alignment5="Interactive" alignment6="Interactive" \ alignment7="beginning" alignment8="beginning" color_stripe="A" \ color_stripe2="A" color_stripe3="A" color_stripe4="A" \ color_stripe5="A" color_stripe6="A" color_stripe7="A" \ color_stripe8="A".;.set upv'n' $show_trunc_upv_1.endfor

11 …and redisplay.for k = #0.to #4.step #2.int l = k + #1.set upv upv'k’.; Show show \ mode="Single" fnum="'k'" matrix_size="128" cell="I'l'" \ cell_border="default" image_border="none" labels="Both" \ numbering="Yes" statistics="None" upv="'upv'" \ truncation="none" ref_image="Single" stripe_ref="Same"\ zoom_factor="'zoom'" \ zoom_centers="" image_step="'SliceSum' sum 'sliceSum'" sim_groups=""\ Info_format="default" \ alignment= "Beginning" alignment2="Beginning" alignment3="Beginning" \ alignment4="Beginning" alignment5="Beginning" alignment6="Beginning" \ alignment7="beginning" alignment8="beginning" color_stripe="A" \ color_stripe2="A" color_stripe3="A" color_stripe4="A" \ color_stripe5="A" color_stripe6="A" color_stripe7="A" \ color_stripe8="A".endfor

12 Simplified Elements Adjusting Slice Thickness is easy!.thicker:.if $show_num_images_1 > #4.then.; variable returned by show.inc SliceSum.gosub display6.else.; Prompt prompt \ title="PIXIE Prompt" text="Slices thick enough" button="Continue" \ control_x="400" control_y="400".gosub display6.endif.return.;==============================================================.thinner:.if SliceSum > #1.then.dec SliceSum.gosub display6.else.; Prompt prompt \ title="PIXIE Prompt" text="Slice thickness = 1" button="Continue" \ control_x="400" control_y="400".gosub display6.;.endif.return

13 Simplified Elements Calculate and display cell size getiib fnum="0" header_field=" rmx ".set matrix $IIB getiib fnum="0" header_field=" rpx (recon pixel size x axis mm)".set rpx $IIB.; calculate the size of the cell and label it.set fmatrix %'matrix'.set frpx = %'rpx'.float im_size = fmatrix * frpx / zoom.set $fpfmt "%3.0f" label \ mode="Label" text=" " font="dfalt_fr_san_bold" \ dir="Horizontal" color="default" background="None" border="None" \ arrow_head="On" arrow_style="Solid Color" cell="A1" \ placement=" "

14 Simplified Elements Calculate and display slice thickness getiib fnum="0" header_field=" zap (z-axis pixel size mm)".set zap $IIB getiib fnum="0" header_field=" slt (slice thickness in pix usually 1)".set slt $IIB.; Calculate and display slice thickness.set fslt %'slt'.set fzap %'zap'.set zap_string "zap".float sl_thck = fzap * fslt * SliceSum.set $fpfmt "%4.1f" label \ mode="Label" text="Slice thickness ='sl_thck'mm" \ font="dfalt_fr_san_bold" \ dir="Horizontal" color="default" background="None" border="None" \ arrow_head="On" arrow_style="Solid Color" cell="A1" \ placement="0.820"

15 Conclusion It’s not rocket science but... Big time saver Fewer rejects More confidence


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