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<div>Hi Debora, I was able to create rectangular openings and apertures using trapezoids (for symmetric pinholes) or wedges (for asymmetric pinholes), but I am not sure if that's what you needed.<br>
Attached screenshot shows the asymmetric pinhole formed by 4 wedges (in different colors). The blue+white forms a symmetric trapezoid, and yellow+red forms an asymmetric trapezoid (red has longer base)<br>
Note, I haven't analyzed the output data from these preliminary construction, but simulations ran without any error.<br>
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<div>PS: I sent this email yesterday but I think it didnt go to the list somehow</div>
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arda<br>
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<img id="27036171-665c-41a1-8003-e7cb48fb954e" height="497" width="480" apple-width="yes" apple-height="yes" src="cid:72834A4A-7B6D-4682-B1AC-C4DE35ADA9E2@ad.umassmed.edu"><br>
On Jan 13, 2014, at 2:26 PM, Débora Salvado wrote:<br>
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Dear GATE users,<br>
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Does anyone know how to build a non-circular pinhole?<br>
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Thanks in advance,<br>
Debora Salvado<br>
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<div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">Arda
Konik<br>
UMASS Medical School<br>
Dept. of Radiology</span> </div>
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