Code : 9345-350300      Created Date : Tuesday, September 15, 2015   Update Date : Tuesday, September 15, 2015    Visit : 1917

World Congress of Medical Physics and Bio medical Engineering

The report of World Congress of Medical Physics and Bio medical Engineering by Dr. Mohammad Reza Ay
 
Application Code :
306-0215-0084
 
Created Date : Sunday, July 19, 2015 16:42:02Update Date : Monday, August 10, 2015 16:03:05
IP Address : 194.225.51.107Submit Date : Monday, August 10, 2015 16:03:13Email : mohammadreza_ay@tums.ac.ir
Personal Information
Name : Mohammad Reza
Surname : Ay
School/Research center : School of Medicine
If you choose other, please name your Research center :  
Position : Associate professor
Tel : +98-21-66466383
Information of Congress
Title of the Congress : World Congress of Medical Physics and Bio medical Engineering
Title of your Abstract : Optimal Pixelated Crystal for a Molecular SPECT Scanner: A GATE Monte Carlo Study
Country : Canada
From : Sunday, June 7, 2015
To : Friday, June 12, 2015
Abstract(Please copy/paste the abstract send to the congress) : Objective: It is well-known that resolution-sensitivity tradeoff is the most challenging design consideration in small-animal SPECT. In the present work, we addressed such a compromise from pixelated crystal point-of-view for HiReSPECT system, a high-resolution SPECT camera, developed at Research Center for Molecular and Cellular Imaging. 
Materials and Methods: For this purpose, we performed GATE Monte Carlo package to simulate the HiReSPECT scanner and to assess the impact of various crystal configurations on tomographic resolution and system sensitivity, using a 99mTc point-like source and a flood-filed phantom, respectively. The crystals differed in material, pixel-size, and Epoxy pixel-gap. Point-spread-functions (PSFs) were iteratively reconstructed using a dedicated 3D OSEM algorithm. Equal importance factors were assigned to the two conflicting objectives, and pixelated crystal was then optimized using the weighted-sum method. In addition, the Monte Carlo simulations were validated by means of comparisons with the experimental data. 
Results: A good agreement (4.3% difference) between simulated and measured tomographic spatial resolutions at 30 mm radius-of-rotation is observed. Likewise, there is a maximum 9.1% difference, at 120 mm source-to-collimator distance, between our Monte Carlo calculations and the experiments for system sensitivity, all for a 1 × 1 mm2 pixel-size and 0.2 mm Epoxy gap CsI(Na) configuration. The results show that CsI(Na) exhibits the highest sensitivity compared to NaI(Tl) and YAP(Ce) as well as a slightly higher spatial resolution, and therefore is the crystal of choice. A sensitivity of 1.61 cps/μCi is achieved for a 1.5 × 1.5 mm2 pixel-size and 0.1 mm Epoxy gap CsI(Na)-based camera. Changing pixel-size from 0.5 × 0.5 mm2 to 2 × 2 mm2 leads to a 35.7% loss in tomographic resolution while sensitivity improves by a factor of 1.52. Based on our Monte Carlo optimization, the 1.5 × 1.5 mm2 pixel-size and 0.1 mm Epoxy gap CsI(Na) is the optimal configuration by providing the best tradeoff between spatial resolution and system sensitivity. The crystal-optimized HiReSPECT system also offers a tomographic resolution of 2.98 mm, in terms of FWHM. 
Conclusion: Our findings highlighted that performance of a preclinical SPECT imager can be highly affected by the pixelated scintillator configuration, and thereby searching for an optimum configuration is mandatory in order to obtain a more qualified SPECT image.
Keywords of your Abstract : Molecular SPECT, HiReSPECT, GATE, pixelated crystal, optimization
Acceptance Letter : http://gsia.tums.ac.ir/images/UserFiles/19549/Forms/306/Pixel_size_SPECT.pdf
The presentation : Oral
The Cover of Abstract book : http://gsia.tums.ac.ir/images/UserFiles/19549/Forms/306/WC2015.pdf
Published abstract in the abstract book with the related code : http://gsia.tums.ac.ir/images/UserFiles/19549/Forms/306/AY.pdf
Where has your abstract been indexed? : none
If you choose other, please name :  
The Congress Reporting Form
How many volunteers were present at the Congress? : 2000
Delegates from which countries presented in the congress? : more than 100 including 
USA, CANAD, UK, Switzerland, Italy, Germany, Netherlands, Sweden, Finland, Japan, Austria, ...
Were the delegates of any other organizations present in the congress? : Yes
If yes, please write the names of the organizations in the box : IAMP
What were the responses to your talking points? Were specific questions or concerns raised? : my talk was interesting to many audience. However I got the first rank in the conference as I had the maximum papers in conference (16 paper, almost 13 oral and 3 poster). my talks covered many area including Nuclear medicine and clinical imaging.
If you met staff members, please list their full names & positions. : Dr Riahi Alam
Dr Salighe rad
Please inform us if there are any follow up actions we need to talk with the members of the congress : there is no specific action that could be follow up. However I personally talked with many researcher and negotiation with them for any possible collaboration. the main potential for collaboration was Dr Hamid Sabet from Harvard that works in our filed. he is really interested to have more collaboration in the field of designing medical imaging systems
Your experiences about the travel processes(Providing ticket, accommodation,...) : for accommodation do not book hotel, renting apartment via airbnb highly suggested. Also for ticket I suggestion online booking couple of months in advance. For accommodation I did a lot of search and found that the apartment t is the best choice as the hotel is very expensive in Toronto. However I highly suggest to not carrying too much cash as there is some limitation based on Canada regulation. When you arrive to Toronto try to have a visit from downtown as there are many shopping center and also high rise building.
Please give a briefing of your own observations and outcomes of the congress: : in addition to scientific part of the congress that keynote speaker part was really impressive. they actually invited from the most famous persons. the most interesting talk belong to Mr. Immel with the fowling background. Mr. Jeff Immelt, GE Chairman and CEO, has held several global leadership positions since coming to GE in 1982, including roles in GE’s Plastics, Appliances, and Healthcare businesses. In 1989 he became an officer of GE and joined the GE Capital Board in 1997.
Mr. Immelt has been named one of the “World’s Best CEOs” three times by Barron’s, and since he began serving as chief executive officer, GE has been named “America’s Most Admired Company” in a poll conducted by Fortune magazine and one of “The World’s Most Respected Companies” in polls by Barron’s and the Financial Times.
Mr. Immelt was the chair of President Obama’s Council on Jobs and Competitiveness. He is a member of The American Academy of Arts & Sciences.
Mr. Immelt earned a B.A. degree in applied mathematics from Dartmouth College in 1978 and an M.B.A. from Harvard University in 1982. He and his wife have one daughter

 

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