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Hi Asra,</div>
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I would suggest reviewing some technical documents (NEMA or AAPM) as the measurement of the intrinsic spatial resolution is based on well defined tests. For example, the NEMA standards for the performance measurements of gamma cameras require the source to
be placed at a distance at least five times greater than the largest linear dimensions of the useful field of view. A lead mask should also be employed to generate line profiles along a specific axis for the calculation of the intrinsic spatial resolution.
Thus, you should modify your source position and include such a mask in your SPECThead.</div>
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Cheers,</div>
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Matthew</div>
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<p class="x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px;"><span style="font-size:10.5pt; color:black; font-family:Calibri,Helvetica,sans-serif">Matthew Strugari</span><span style="font-size:10.5pt; color:black"></span></p>
<span style="font-family:Calibri,Helvetica,sans-serif"></span><span style="font-size:10.5pt; color:black" lang="EN-US"><span style="font-family:Calibri,Helvetica,sans-serif">Biomedical Translational Imaging Centre -
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Gate-users <gate-users-bounces@lists.opengatecollaboration.org> on behalf of Asra Talebi <asra.talebi@modares.ac.ir><br>
<b>Sent:</b> August 21, 2019 8:23 AM<br>
<b>To:</b> gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br>
<b>Subject:</b> [Gate-users] Intrinsic spatial resolution in SPECT</font>
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<p style="margin-top: 0px; margin-bottom: 0px;">HELLO</p>
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<p style="margin-top: 0px; margin-bottom: 0px;">I calculated Intrinsic spatial resolution of the SPECT camera with a point source, positioned<br>
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<div>at the top of detector , 2 mm from the crystal surface.THE FWHM of the point source was calculated 9.8 mm.but the real value of intrinsic spatial resolution is 3.5 mm.I change
<span>setSpresolution</span> in digitizer macro file but the FWHM do not vary <span class="x_tlid-translation x_translation" lang="en">
<span title="" class="x_alt-edited">Significant</span></span>.
<div>how can i modify spect head or digitizer macro file for receiving real results.
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<div>thanks<br>
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<div>/gate/digitizer/Singles/insert adder<br>
/gate/digitizer/Singles/insert blurring<br>
/gate/digitizer/Singles/blurring/setResolution 0.099<br>
/gate/digitizer/Singles/blurring/setEnergyOfReference 140. keV<br>
/gate/digitizer/Singles/insert spblurring<br>
/gate/digitizer/Singles/spblurring/setSpresolution 2.3 mm<br>
/gate/digitizer/Singles/spblurring/verbose 0<br>
/gate/digitizer/Singles/insert thresholder<br>
/gate/digitizer/Singles/thresholder/setThreshold 126 keV<br>
/gate/digitizer/Singles/insert upholder<br>
/gate/digitizer/Singles/upholder/setUphold 154 keV<br>
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<sub><span style="font-size:12pt">asra sadat talebi</span></sub><br>
<span style="font-size:12pt">PhD Scholar</span><br>
<span style="font-size:12pt">Tarbiat Modares University</span><br>
<span style="font-size:12pt">Department of medical physics</span><br>
<span style="font-size:12pt">Tehran - Iran</span><br>
<span style="font-size:12pt">E-mail address: </span><span style="color:rgb(0,111,201); font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:12pt">asra.talebi@modares.ac.ir</span></p>
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<span style="color:rgb(0,111,201); font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"><span style="color:rgb(0,111,201); font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:12pt">asra.talebi@yahoo.com</span><br>
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