[Gate-users] Intrinsic spatial resolution in SPECT

[Matthew Strugari]

Hi Asra,

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.

Cheers,
Matthew


--

Matthew Strugari

Biomedical Translational Imaging Centre - BIOTIC,
5890 University Ave,
Halifax, NS, B3K 6R8

________________________________
From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> on behalf of Asra Talebi <asra.talebi at modares.ac.ir>
Sent: August 21, 2019 8:23 AM
To: gate-users at lists.opengatecollaboration.org <gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] Intrinsic spatial resolution in SPECT


HELLO


I calculated Intrinsic spatial resolution of the SPECT camera with a point source, positioned

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 setSpresolution in digitizer macro file but the FWHM   do not vary Significant.
how can i modify spect head or digitizer macro file for receiving real results.



thanks


/gate/digitizer/Singles/insert adder
/gate/digitizer/Singles/insert blurring
/gate/digitizer/Singles/blurring/setResolution 0.099
/gate/digitizer/Singles/blurring/setEnergyOfReference 140. keV
/gate/digitizer/Singles/insert spblurring
/gate/digitizer/Singles/spblurring/setSpresolution 2.3 mm
/gate/digitizer/Singles/spblurring/verbose 0
/gate/digitizer/Singles/insert thresholder
/gate/digitizer/Singles/thresholder/setThreshold 126 keV
/gate/digitizer/Singles/insert upholder
/gate/digitizer/Singles/upholder/setUphold 154 keV









































asra sadat talebi
PhD Scholar
Tarbiat Modares University
Department of medical physics
Tehran - Iran
E-mail address:  asra.talebi at modares.ac.ir

asra.talebi at yahoo.com

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