<html><head><style>p{margin-top:0px;margin-bottom:0px;}</style></head><body><div style="font-size:10pt; font-family:Gulim, sans-serif;"><p>Dear Hussain,</p><p> </p><p>Please see the attached slide#18-25 to define hexagonal collimators.</p><p>The slide was presented in the GATE training course at Tohoku Univeristy (Feb-2020).</p><p> </p><p>It seems that you missed the definition of linear repeater.</p><p>In addition to that, pitches of hole with cubicArray repeater for x- and y- directions should NOT be same.(see the slide#20)</p><p> </p><p>Hopefully, you can succeed in defining your own hesagonal collimators in GATE.</p><p> </p><p>Best regards,</p><p> </p><p>Han Gyu Kang</p><p> </p>--------Han Gyu Kang, Ph.D, Researcher<br><br>National Institute of Radiological Sciences (NIRS)<br>National Institutes for Quantum and Radiological Science and Technology (QST)<br> 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, JAPAN<p> </p><p style="font-size:10pt;font-family:sans-serif;padding:0 0 0 10pt"><span>-----Original Message-----</span><br><b>From:</b> "Khalid Hussain"<khalidhussain1134@gmail.com> <br><b>To:</b> <Gate-users@lists.opengatecollaboration.org>; <br><b>Cc:</b> <br><b>Sent:</b> 2020-07-20 (월) 10:16:11 (GMT+09:00)<br><b>Subject:</b> [Gate-users] Gap in Hexagonal LEHR collimator geometry<br> </p><div dir="ltr"><div dir="auto">Dear gate users,<div dir="auto"> </div><div dir="auto">There are small gaps in the collimator geometry. The collimator is standard multi hole LEHR collimator for spect camera. The screenshot of geometry and script is attached.</div><div dir="auto"> </div><div dir="auto">Please check and help me where the problem is in geometry.</div><div dir="auto"> </div><div>Thank you.</div><div>Khalid</div><div><img src="cid:ii_kcttd6k20" alt="collimator2_4.24.PNG" width="452" height="284" loading="lazy"><div><img src="cid:ii_kcttd6kl1" alt="collimator1_4.24.PNG" width="452" height="220" loading="lazy"> </div></div><div> </div><div> </div><div>Collimator dimensions are x =59.1 cm, y= 44.5cm, z=2.405cm<br><font color="#ff0000">/gate/collimator/daughters/name hole<br>/gate/collimator/daughters/insert hexagone<br>/gate/hole/geometry/setHeight 24.05 mm<br>/gate/hole/geometry/setRadius 0.555 mm<br>/gate/hole/placement/setRotationAxis 1 0 0<br>/gate/hole/placement/setRotationAngle 0 deg<br>/gate/hole/setMaterial Air<br>/gate/hole/vis/forceWireframe<br>/gate/hole/vis/setColor cyan<br> </font></div><div><font color="#ff0000"># FILL THE WHOLE COLLIMATOR WITH SEPTA-HOLE<br>/gate/hole/repeaters/insert cubicArray<br>/gate/hole/cubicArray/setRepeatNumberX 465<br>/gate/hole/cubicArray/setRepeatNumberY 350 <br>/gate/hole/cubicArray/setRepeatNumberZ 1<br>/gate/hole/cubicArray/setRepeatVector 1.27 1.27 0.0 mm</font> </div><div> </div><div>Any help will be highly appreciated.</div></div>
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