Define septal penetration
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PDF Physics in Nuclear Medicine - University of Michigan
1 . Defining a system β GATE documentation
PDF Basic Principles of Gamma Camera Imaging and Quality Control
PDF Slides to IAEA Nuclear Medicine Physics Handbook
Collimators - Virginia Commonwealth University
PDF Imaging and detectors for medical physics Lecture 5: Gamma . . .
Designs: Collimators for Nuclear Medicine
Planar Imaging and the Characteristics of Acquisition
Fenestration - an overview | ScienceDirect Topics
Transseptal Puncture: A Step-by-Step Procedural Guide . . .
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www .umich .edu/~ners580/ners-bioe_481/lectures/pdfs/Sorenson_chpt-16 .pdf
Septal Thickness A primary consideration in collimator design is to ensure that septal penetration by "Y rays crossing from one collimator hole into another is negligibly small . This is essential if an accurate "Y-ray image is to be projected by the collimator onto the camera detector .
1 .4 .8 .4 . Septal Penetration ΒΆ If one wants to record, for every photon detected, how many times they crossed the collimator septa, the command recordSeptalPenetration must be turned on (default value is false) and the septal volume name must be attached to a PhantomSD:
amos3 .aapm .org/abstracts/pdf/99-30890-359478-110770 .pdf
(Except for occasional septal penetration .) Page 8 Types of Imaging . . . B . Define direction of incoming gamma rays entering crystal C . Substantially eliminate scatter D . Reduce count rate to prevent dead time E . Shield the electronics Reference: The Essential Physics of Medical
Septal penetration and scatter increases with energy . Thus, collimators are designed for energy ranges . Nuclear Medicine Physics: A Handbook for Teachers and Students - Chapter 11 - Slide 14/185 . IAEA 11 .2 GAMMA CAMERA SYSTEMS 11 .2 .2 The Anger camera 11 .2 .2 .1 Collimators .
www .people .vcu .edu/~mhcrosthwait/clrs322/Collimation .html
If the septa are not thick enough then septal penetration occurs This is referred to as the star artifact Star artifact is enhanced when there is high energy radionuclide within a small volume . Best example of this is imaging a patient with a large amount of 131 I
Septal thickness . Page 12/42 Parallel-hole collimator efficiency β’ Geometric efficiency πΊ defined as fraction of -rays detected = transmitted by collimator divided by total number of -rays emitted . . . β’ D = septal penetration - -ray penetrates through wall of
nuclearfields .com/collimators-designs .htm
Higher septal penetration will increase background noise, which can cause dramatic reduction in image resolution . As for Fanbeam and Conebeam designs, the most important aspect is the accuracy of the focal point . Only with an accurate focal point you will be able to achieve the maximum gain in sensitivity without losing resolution .
www .people .vcu .edu/~mhcrosthwait/clrs322/planarimagingacquisition .html
FWTM also measures septal penetration in the collimator . Take this number, multiply by 3 . If this value equal or is greater than FWHM, then a higher energy collimator should be employed . If you multiply FWTH x 3 = to FWHM,where does the scatter come from? From the peak drawn above let us assume that a count profile is generated below .
Septal fenestration and tumor cyst fenestration are two of the simplest endoscopic procedures owing the relative avascular nature of these membranes . Fenestration of the septum pellucidum should be considered in any patient in which a tumor mass is situated in the anterior third ventricle or within the lateral ventricle at the foramen of Monro . . .
The transseptal puncture (TP) technique was introduced into clinical practice during the late 1950s by Ross et al as a diagnostic tool to properly select patients for cardiac valve surgery . 1,2 Over the years, its use for diagnostic purposes has declined, but a number of new interventional procedures utilizing TP have been developed . Currently, the most common indications are left heart . . .
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Define septal penetration
