scholarly journals Optimization of a Calibration Phantom for Quantitative Radiography

2020 ◽  
Author(s):  
Cristóbal Martinez ◽  
Claudia de Molina ◽  
Manuel Desco ◽  
Mónica Abella
Keyword(s):  
Calibration Phantom

A CALIBRATION PHANTOM FOR DIRECT, IN VIVO MEASUREMENT OF 241Am IN THE AXILLARY LYMPH NODES

2009 ◽  
Vol 97 (3) ◽  
pp. 219-227 ◽  
Author(s):  
Rachel Zeman ◽  
Megan Lobaugh ◽  
Henry Spitz ◽  
Samuel Glover ◽  
David Hickman
Keyword(s):  
Lymph Nodes ◽  
Axillary Lymph Nodes ◽  
Axillary Lymph ◽  
In Vivo Measurement ◽  
Calibration Phantom

Design and Validation of Synchronous QCT Calibration Phantom: Practical Methodology

2019 ◽  
Vol 50 (1) ◽  
pp. 157-162 ◽  
Author(s):  
Malakeh Malekzadeh ◽  
Shahrokh Abbasi-Rad ◽  
Mohamad Shahgholi ◽  
Parisa Naghdi ◽  
Marzieh Sadat Hoseini ◽  
...  
Keyword(s):  
Calibration Phantom

scholarly journals Quantitative Accuracy of Low-Count SPECT Imaging in Phantom and In Vivo Mouse Studies

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Ciara M. Finucane ◽  
Iain Murray ◽  
Jane K. Sosabowski ◽  
Julie M. Foster ◽  
Stephen J. Mather
Keyword(s):  
Single Photon ◽  
Photon Emission ◽  
Quantitative Information ◽  
Emission Computed Tomography ◽  
Biodistribution Studies ◽  
Calibration Phantom ◽  
Quantitative Accuracy ◽  
Wide Range ◽  
True Activity

We investigated the accuracy of a single photon emission computed tomography (SPECT) system in quantifying a wide range of radioactivity concentrations using different scan times in both phantom and animal models. A phantom containing various amounts of In-111 or Tc-99m was imaged until the activity had decayed close to background levels. Scans were acquired for different durations, employing different collimator pinhole sizes. VOI analysis was performed to quantify uptake in the images and the values compared to the true activity. The phantom results were then validated in tumour-bearing mice. The use of an appropriate calibration phantom and disabling of a background subtraction feature meant that absolute errors were within 12% of the true activity. Furthermore, a comparison of in vivo imaging and biodistribution studies in mice showed a correlation of 0.99 for activities over the 200 kBq to 5 MBq range. We conclude that the quantitative information provided by the NanoSPECT camera is accurate and allows replacement of dissection studies for assessment of radiotracer biodistribution in mouse models.

Unintended attenuation in the Leksell Gamma Knife® Perfexion™ calibration-phantom adaptor and its effect on dose calibration

2009 ◽  
Vol 36 (4) ◽  
pp. 1208-1211 ◽  
Author(s):  
Jagdish P. Bhatnagar ◽  
Josef Novotny ◽  
Mubina A. Quader ◽  
Greg Bednarz ◽  
M. Saiful Huq
Keyword(s):  
Gamma Knife ◽  
Calibration Phantom

Reconstruction of a Human Skull Calibration Phantom Using Bone Sections From an 241Am Exposure Case

1988 ◽  
Vol 55 (1) ◽  
pp. 59-65 ◽  
Author(s):  
David P. Hickman ◽  
Norman Cohen
Keyword(s):  
Human Skull ◽  
Calibration Phantom

Assessment Of Mineral Changes In The Spine With Computer Tomography Using A Calibration Phantom

1984 ◽  
Author(s):  
Tamas Sandor ◽  
Barbara Weissman ◽  
William B. Hanlon ◽  
Daniel A. Bergman ◽  
Calvin Rumbaugh
Keyword(s):  
Computer Tomography ◽  
Calibration Phantom ◽  
Mineral Changes

scholarly journals Fluoroscopy-based laser projection system for surgical guidance and its calibration methods

10.29007/m1cq ◽  
2018 ◽  
Author(s):  
Sanghyun Joung ◽  
Hyunwoo Lee ◽  
Chul-Woo Park ◽  
Chnag-Wug Oh ◽  
Il-Hyung Park
Keyword(s):  
Experimental System ◽  
Ccd Camera ◽  
Calibration Method ◽  
Optical Tracking ◽  
Angular Error ◽  
Measurement Unit ◽  
Projection System ◽  
Calibration Phantom ◽  
Calibration Methods ◽  
Laser Module

We have developed a laser projection system, which can project laser on corresponding position to surgical planning drawn at a fluoroscopic image without an optical tracking system. In this paper, we introduce a spatial calibration method between a laser module and a fluoroscope for the laser projection and evaluate its accuracy with a mimic experimental system. The experimental system consists of a laser module, a distance measurement unit and a CCD camera. The laser modules can project arbitrary line on surface by reflecting a point source laser with two galvanometers. We designed a calibration phantom by combining a collimator for accurate laser pattern positioning and stainless steel ball arrays for calculation of an extrinsic parameter of a C-arm fluoroscopy. We set a projection plane having ruler in 400mm distance from the CCD camera, and set 54 points on the screen. The laser module projects points with respect to the set points, and a distance error between set points and projected points and angular error are calculated. The distance errors is 1.5±1.9 mm (average ± standard deviation). Maximum error was 7.5 mm. Angular error was smaller than 2 degrees. The laser projection system and its calibration method shows clinically acceptable accuracy and the clinical application is the next step.

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