A5077346610- Medical Imaging Techniques and Applications
- Radiomics and Machine Learning in Medical Imaging
- Advanced X-ray and CT Imaging
- Advanced Radiotherapy Techniques
- Advanced MRI Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Radiation Dose and Imaging
- Radiopharmaceutical Chemistry and Applications
- Cardiac Imaging and Diagnostics
- AI in cancer detection
- Electrochemical sensors and biosensors
- Radiation Therapy and Dosimetry
- ECG Monitoring and Analysis
- Management of metastatic bone disease
- Atomic and Subatomic Physics Research
- COVID-19 diagnosis using AI
- Cardiac electrophysiology and arrhythmias
- Effects of Radiation Exposure
- Non-Invasive Vital Sign Monitoring
- Cardiac Ischemia and Reperfusion
- Peptidase Inhibition and Analysis
- Radioactive Decay and Measurement Techniques
- Molecular Sensors and Ion Detection
- Cancer Diagnosis and Treatment
- Radioactivity and Radon Measurements
Tehran University of Medical Sciences
2017-2025
Imam Khomeini Hospital
2021-2024
Tabriz University of Medical Sciences
2011-2013
Isfahan University of Medical Sciences
2013
This work was set out to investigate the feasibility of dose reduction in SPECT myocardial perfusion imaging (MPI) without sacrificing diagnostic accuracy. A deep learning approach proposed synthesize full-dose images from corresponding low-dose at different levels projection space.Clinical SPECT-MPI 345 patients acquired on a dedicated cardiac camera list-mode format were retrospectively employed predict standard-dose half-, quarter-, and one-eighth-dose levels. To simulate realistic...
Image artefacts continue to pose challenges in clinical molecular imaging, resulting misdiagnoses, additional radiation doses patients and financial costs. Mismatch halo occur frequently gallium-68 (
Novel cadmium oxide nanoparticles based sensor for the detection of penicillamine (PA) in aqueous solution has been developed. Cyclic voltammetry at potential range -1.1 to 1.1V from buffer (pH 7) containing CdO produced a well-defined deposited on surface glassy carbon electrode. The Differential pulse is carried out 0.451V with pH 7. Cadmium have many advantageous such as remarkable catalytic activity, simple preparation procedure and long-term stability signal response during oxidation.
Date palm seed extract (DPSE) has various compounds revealing antioxidant features. This study aimed to evaluate the radioprotective effect of DPSE in total body gamma irradiation.At first, chemical characteristics were analyzed by ultraviolet, visible and Fourier transform infrared spectroscopy. Then, toxicity was assessed. For this purpose, 60 mice divided into five groups, each groups injected doses 100, 200, 300, 400, 500 mg/kg, respectively. At termination experiment, mortality rate...
There are a variety of electrocardiogram based methods to detect myocardial infarction (MI) patients. This study used the signal averaged (SAECG) and its wavelet coefficient as an index MI. Orthogonal leads signals from 50 acute (AMI) healthy subjects were selected national metrology institute Germany (PTB diagnostic database). They filtered discrete transformed was exerted on them. Four conventional features two new introduced in this extracted SAECG decompositions. Finally for data...
One of the major challenges in design and developing PET, scanners are presence inactive areas between detector blocks which degrade image spatial resolution leads to streaking artifacts especially when we employ analytical reconstruction. The aim this study is assess feasibility generating gap-free PET using deep convolutional encoder-decoder sinogram space. gap-corrupted sinograms simulated HRRT scanner, without gaps as ideal/ground truth predicted owing implemented our deep-fill method...
Objectives This study aimed to measure standardized uptake value (SUV) variations across different PET/computed tomography (CT) scanners harmonize quantification systems. Methods We acquired images using the National Electrical Manufacturers Association International Electrotechnical Commission phantom from three PET/CT operated routine imaging protocols at each site. The SUVs of lesions were assessed in presence reference values by a digital object (DRO) and recommendations European Nuclear...
The limited axial field-of-view (FOV) of conventional clinical positron emission tomography (PET) scanners (∼15 to 26 cm) allows detecting only 1% all coincidence photons, hence limiting significantly their sensitivity. To overcome this limitation, the EXPLORER consortium developed world's first total-body PET/CT scanner that increased sensitivity, thus enabling decrease scan duration or injected dose.The purpose study is perform and validate Monte Carlo simulations uEXPLORER PET scanner,...
Modeling of the collimator-detector response (CDR) in SPECT reconstruction enables improved resolution and more accurate quantitation, especially for higher energy imaging (e.g.Lu-177 Ac-225). Such modeling, however, can pose a significant computational bottleneck when there are substantial components septal penetration scatter acquired data, since direct convolution-based approach requires large 2D kernels. The present work presents an alternative method fast CDR compensation using linear...
Radiopharmaceutical therapies (RPTs) present a major opportunity to improve cancer therapy. Although many current RPTs use the same injected activity for all patients, there is interest in using absorbed dose measurements enable personalized prescriptions. Image-based calculations incur uncertainties from calibration factors, partial volume effects and segmentation methods. While previously published estimation protocols incorporate these uncertainties, they do not account uncertainty...
The Q.Clear algorithm is a fully convergent iterative image reconstruction technique. We hypothesize that different PET/CT scanners with distinct crystal properties will require optimal settings for the algorithm. Many studies have investigated improvement of on scanner LYSO crystals and SiPM detectors. propose an optimum penalization factor (β) detection rectal cancer its metastases using BGO-based detector system which obtained via accurate comprehensive phantom clinical studies.18F-FDG...
Abstract Objective. To improve positron emission tomography (PET) image quality, we aim to generate images of quality comparable standard scan duration using short (1/8 and 1/16 duration) inputs assess the generated quantitative qualitatively. Also, effect training dataset properties (i.e. body mass index (BMI)) on performance model(s) will be explored. Approach. Whole-body PET scans 42 patients (41 18 F-FDG one 68 Ga-PSMA) scanned with radiotracer dosage were included in this study. One...
Introduction: In recent years, different geometries of brain-dedicated PET scanners have been developed due to the fact that there are great emerging demands for high-quality and low-cost scanners. To meet demand, we present a novel conceptual design based on partial cylindrical detector geometry evaluate performance designed scanner.