WORKS IN PROGRESS; HIGH DOSE DOUBLE INJECTION TL-201 STRESS TEST SCINTIGRAPHY WITH 3D SURFACE MAPPED AND SPECT IMAGE RECONSTRUCTION WITH A STATE-OF-THE-ART SINGLE HEAD ANGER GAMMA CAMERA (ORBITER, SIEMENS CORP) AND A MODERN NUCLEAR MEDICINE COMPUTER SYSTEM (PINNACLE COMPUTER, MEADASYS CORP)

1993 ◽  
Vol 18 (2) ◽  
pp. 177
Author(s):  
R. C. Walker ◽  
CM Boyd
Keyword(s):  
Nuclear Medicine ◽  
Image Reconstruction ◽  
Computer System ◽  
Gamma Camera ◽  
State Of The Art ◽  
Stress Test ◽  
High Dose ◽  
Double Injection ◽  
3D Surface ◽  
Spect Image

scholarly journals Quantification of Patient Specific Dosimetry in Radionuclide Therapy: A Phantom Study

2016 ◽  
Vol 17 (2) ◽  
pp. 134-137
Author(s):  
Kamila Afroj Quadir ◽  
Brian Zimmermann ◽  
Md Nahid Hossain ◽  
Md Nurul Islam ◽  
Ferdoushi Begum ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Radionuclide Therapy ◽  
Gamma Camera ◽  
Absorbed Dose ◽  
Calibration Factor ◽  
Patient Specific ◽  
Dose Calibrator ◽  
Spect Image ◽  
Reconstruction Quantification ◽  
Spect System

The accuracy of patient specific dosimetry is correlated with measured organ activity by gamma camera and SPECT system. The assessment of the radiation-absorbed dose by patients undergoing nuclear medicine investigation requires accurate measurement of organ activity, biokinetics data, as well as physical data. Activities were estimated by using Ba-133 phantom with both planar and SPECT systems. The objective of the study was to measure the activities of Ba-133 from gamma camera images using both planar and SPECT studies and compare the reference values with the dose calibrator values to quantify the actual activity with gamma camera. Four Ba-133 sources of different volume and activity 379, 950, 1219 and 1150 KBq are measured by using Veenstra Instrument VDC 404 Dose Calibrator. The second smallest source was used to determine the calibration factor. Acquisition, corrections, reconstruction, quantification and measuring activity from both planar and SPECT imaging were done with all Ba-133 sources in air. The activities of the Ba-133 sources were also measured using I-131 settings of the dose calibrator. The measurement of the second smallest source was used to obtain the calibration factor. This calibration factor was used to convert the planer and SPECT image count of all the sources into activities. In case of both planar and SPECT gamma camera, the measurements showed good correlations and all the values varied within ±15%. Planer and SPECT gamma camera image counts can be used to calculate activity in the organ. This information can play a very significant role in evaluating image based patient specific dosimetry in radionuclide therapy.Bangladesh J. Nuclear Med. 17(2): 134-137, July 2014

Operating a nuclear medicine computer system with a remote mobile gamma camera

1978 ◽  
Vol 23 (5) ◽  
pp. 981-985 ◽  
Author(s):  
A T Elliott ◽  
N J G Brown ◽  
D Burns ◽  
P J Ell
Keyword(s):  
Nuclear Medicine ◽  
Computer System ◽  
Gamma Camera

Position paper nuclear cardiology: Update 2008

2009 ◽  
Vol 48 (02) ◽  
pp. 71-78 ◽  
Author(s):  
F. Bengel ◽  
U. Büll ◽  
W. Burchert ◽  
P. Kies ◽  
R. Kluge ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Nuclear Cardiology ◽  
State Of The Art ◽  
Position Paper ◽  
Circulation Research ◽  
Diagnostic Algorithms ◽  
Clinical Diagnostic ◽  
Common Position ◽  
German Association

SummaryNuclear cardiology is well established in clinical diagnostic algorithms for many years. This is an update 2008 of the first common position paper of the German Association of Nuclear Medicine and the German Association of Cardiology, Heart and Circulation Research published in 2001 aiming at an overview of state-of-the-art scintigraphic methods.

Development of a simultaneous imaging system to measure the optical and gamma ray images of Ir-192 source for high-dose-rate brachytherapy

2021 ◽  
Vol 16 (12) ◽  
pp. T12005
Author(s):  
J. Nagata ◽  
S. Yamamoto ◽  
Y. Noguchi ◽  
T. Nakaya ◽  
K. Okudaira ◽  
...  
Keyword(s):  
Dose Rate ◽  
Spatial Resolution ◽  
Gamma Camera ◽  
Gamma Ray ◽  
Imaging System ◽  
High Dose Rate ◽  
High Dose ◽  
Cmos Camera ◽  
Absolute Position ◽  
The Absolute

Abstract In high-dose-rate (HDR) brachytherapy, verification of the Ir-192 source's position during treatment is needed because such a source is extremely radioactive. One of the methods used to measure the source position is based on imaging the gamma rays from the source, but the absolute position in a patient cannot be confirmed. To confirm the absolute position, it is necessary to acquire an optical image in addition to the gamma ray image at the same time as well as the same position. To simultaneously image the gamma ray and optical images, we developed an imaging system composed of a low-sensitivity, high-resolution gamma camera integrated with a CMOS camera. The gamma camera has a 1-mm-thick cerium-doped yttrium aluminum perovskite (YAIO3: YAP(Ce)) scintillator plate optically coupled to a position-sensitive photomultiplier (PSPMT), and a 0.1-mm-diameter pinhole collimator was mounted in front of the camera to improve spatial resolution and reduce sensitivity. We employed the concept of a periscope by placing two mirrors tilted at 45 degrees facing each other in front of the gamma camera to image the same field of view (FOV) for the gamma camera and the CMOS camera. The spatial resolution of the imaging system without the mirrors at 100 mm from the Ir-192 source was 3.2 mm FWHM, and the sensitivity was 0.283 cps/MBq. There was almost no performance degradation observed when the mirrors were positioned in front of the gamma camera. The developed system could measure the Ir-192 source positions in optical and gamma ray images. We conclude that the developed imaging system has the potential to measure the absolute position of an Ir-192 source in real-time clinical measurements.

scholarly journals Pay Attention to Devils: A Photometric Stereo Network for Better Details

2020 ◽  
Author(s):  
Yakun Ju ◽  
Kin-Man Lam ◽  
Yang Chen ◽  
Lin Qi ◽  
Junyu Dong
Keyword(s):  
Neural Network ◽  
State Of The Art ◽  
Photometric Stereo ◽  
Normal Map ◽  
Surface Normal ◽  
3D Surface ◽  
Surface Reconstructions ◽  
Higher Weights

We present an attention-weighted loss in a photometric stereo neural network to improve 3D surface recovery accuracy in complex-structured areas, such as edges and crinkles, where existing learning-based methods often failed. Instead of using a uniform penalty for all pixels, our method employs the attention-weighted loss learned in a self-supervise manner for each pixel, avoiding blurry reconstruction result in such difficult regions. The network first estimates a surface normal map and an adaptive attention map, and then the latter is used to calculate a pixel-wise attention-weighted loss that focuses on complex regions. In these regions, the attention-weighted loss applies higher weights of the detail-preserving gradient loss to produce clear surface reconstructions. Experiments on real datasets show that our approach significantly outperforms traditional photometric stereo algorithms and state-of-the-art learning-based methods.

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