A5088877108- Radiation Dose and Imaging
- Digital Radiography and Breast Imaging
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Advanced Radiotherapy Techniques
- AI in cancer detection
- Advances in Oncology and Radiotherapy
- Pediatric Urology and Nephrology Studies
- Radiology practices and education
- Breast Lesions and Carcinomas
- Healthcare Operations and Scheduling Optimization
- Infrared Thermography in Medicine
- Bone health and treatments
- Medical and Biological Sciences
- Kidney Stones and Urolithiasis Treatments
- Hip and Femur Fractures
- Bone health and osteoporosis research
- Global Cancer Incidence and Screening
- Vascular Anomalies and Treatments
Imperial College Healthcare NHS Trust
2019-2022
Acibadem City Clinic
2016-2020
National Center of Radiobiology and Radiation Protection
2008-2016
Purpose: To assess the frequency, appropriateness, and radiation doses associated with multiphase computed tomography (CT) protocols for routine chest abdomen–pelvis examinations in 18 countries. Materials Methods: In collaboration International Atomic Energy Agency, multi-institutional data on clinical indications, number of scan phases, parameters, dose descriptors (CT dose–index volume; dose–length product [DLP]) were collected (n = 1706 patients) 426 CT from institutions Asia, Africa,...
Journal Article Patient doses from PET-CT procedures Get access S. Avramova-Cholakova, Avramova-Cholakova * 1National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria *Corresponding author: s_avramova@mail.bg Search for other works by this author on: Oxford Academic PubMed Google Scholar Ivanova, Ivanova 2University Multiprofile Hospital Active Treatment 'St Marina', Varna, E. Petrova, Petrova 3University 'Alexandrovska', M. Garcheva, Garcheva J. Vassileva Protection...
The aim of this work is to estimate patient doses from hybrid single-photon emission computed tomography (SPECT) and (CT) procedures. study involved all four SPECT–CT systems in Bulgaria. Effective dose was estimated for about 100 patients per system. Ten types examinations were considered, representing diagnostic procedures performed the systems. SPECT component calculated applying ICRP 53 80 conversion coefficients. Computed index length product retrospectively obtained archives systems,...
This work is aimed to study the variability of dosimetry results owing various measurement methodologies for breast dosimetry. performed in frame development a national protocol Doses standard phantom and group patients were calculated two mammography systems from tube output measured with calibrated ionisation chamber. The backscatter under chamber contributes an increase dosimeter readings ∼0.8–1.5%, whereas proximity compression plate causes air kerma value by 6.5–7%. High layer (HVL)...
Journal Article Dosimetry methods for multi-detector computed tomography Get access M. Gancheva, Gancheva * National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria *Corresponding author: mvgancheva@gmail.com Search other works by this author on: Oxford Academic PubMed Google Scholar I. Dyakov, Dyakov J. Vassileva, Vassileva S. Avramova-Cholakova, Avramova-Cholakova D. Taseva Protection Dosimetry, Volume 165, Issue 1-4, July 2015, Pages 190–193,...
The purpose of this work is to compare the state a representative number mammography systems in Bulgaria terms incident air kerma (IAK) and film optical density (OD) propose optimisation measures where appropriate. IAK with standard phantom OD exposed films were measured on 22 % all units country. values ranged from 2 24.3 mGy, median being 7.9 first third quartiles respectively 5 11.2 mGy mean 8.6 mGy. 0.5 2.4. Only 36 had within recommended range. 27 satisfactorily set range below...
Pilot study of patient and phantom breast dose measurements in Bulgaria A pilot on two mammography units was conducted. The mean glandular doses (MGDs) to samples approximately 60 women per unit were measured. MGD with a standard PMMA measured as well. MGDs calculated according the European protocol dosimetry well for quality control physical technical aspects screening. women's divided into three groups depending compressed thicknesses. results group thicknesses interval 40-60 mm compared...
According to the Bulgarian regulation for radiation protection at medical exposure, National Centre of Radiobiology and Radiation Protection (NCRRP) is responsible performing national dose surveys in diagnostic interventional radiology nuclear medicine establishing reference levels (DRLs). The next survey under preparation be performed period 2015-16, with aim cover conventional radiography, mammography, fluoroscopy, fluoroscopy guided procedures CT. It will electronically using centralised...
Journal Article Implementation of the European protocol for quality control technical aspects mammography screening in Bulgaria Get access J. Vassileva, Vassileva *Corresponding author: j.vassileva@ncrrp.org Search other works by this author on: Oxford Academic PubMed Google Scholar S. Avramova-Cholakova, Avramova-Cholakova A. Dimov, Dimov Lichev Radiation Protection Dosimetry, Volume 114, Issue 1-3, 17 May 2005, Pages 403–405, https://doi.org/10.1093/rpd/nch569 Published: 2005
National protocol for quality assurance in DXA-bone densitometry Osteoporosis becomes largely one of the most important socially significant and costly diseases. Modern techniques (DXA, US) are applied bone densitometry. The paper presents a especially densitometers including control made compliance with international standards (ISCD, IOF). methodology has been tested practice by measurements on site-functional assessment, entrance dose, radiation protection, calibration, in-vitro precision....
Journal Article Eight years of quality control in Bulgaria: impact on mammography practice Get access S. Avramova-Cholakova, Avramova-Cholakova * 1National Centre Radiobiology and Radiation Protection, Sofia, Bulgaria *Corresponding author: s_avramova@mail.bg Search for other works by this author on: Oxford Academic PubMed Google Scholar G. Lilkov, Lilkov 2Gammakonsult Ltd, M. Kaneva, Kaneva 3Medigray Plovdiv, K. Terziev, Terziev 4Raycontrol I. Nakov, Nakov 5Shumen Cancer Centre, Shumen, N....
The purpose is to compare full-field digital mammography (FFDM), breast tomosynthesis (DBT) and contrast-enhanced spectral (CESM) technologies on three systems in terms of image quality patient dose. Two Senographe Essential with DBT CESM (denoted S1 S2) one Selenia Dimensions (S3) FFDM were considered. Dosimetry methods recommended the European protocol used. Image was tested CDMAM ideal observer method FFDM. Mean values mean glandular dose (MGD) from whole samples S1, S2 S3 as follows:...