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Now showing items 1-20 of 24

Radioactivity of sand in the coastal strip from Beruwala to Dondra, Sri Lanka

Bandara, Muditha S; Mahawatte, Palee (Sri Lanka Association for the Advancement of Science, 2013)

All living beings on earth are continuously exposed to radiation from primordial radio nuclides 232Th, 238U and 40K present in soils and sands. Due to their long half lives these radionuclide remain in soils and sands for ...
SuSi : A Monte Carlo model of a novel proton CT Scanner using Geant4

Price, Tony; Taylor, Jon; Esposito, Michela; Poludniowski, Gavin; Jeyasingam, Jeyasugiththan (University of Birmingham, UK, 2014)

Proton radiotherapy uses beams of high energy protons to treat cancer. It is specifically used for cancers in children and near delicate structures due to the ability of delivering a highly focused dose to the cancer volume. ...
Transfer of natural radionuclides from soil to Centella asiatica, a medicinal plant grown in Colombo district, Sri Lanka

Chandrasiri, M.R.D.A; Kumari, Peshala; Bandara, Muditha S; Lamabadusuriya, Manuja (27th FAOBMB Conference and 44th Annual Conference of MSBMB, Malaysia, 2019)

Natural radionuclides are taken up by the herbs from the environment and are accumulated in varied concentrations in different parts of the plant. Therefore, it is considered as a type of contaminant in herbal medicines, ...
Facility reference level for common x-ray procedures: A preliminary study

Satharasinghe, DM; Jeyasugiththan, J; Pallewatte, AS; Wanninayake, WMNMB (Asia-Oceania Congress of Medical Physics (AOCMP), 2020)

Ionizing radiation is an essential tool in medical diagnosis and it brings great benefit to the patient. However, the associated risks due to the radiation are unavoidable. Therefore, close monitoring of radiation exposure ...
Facility reference level for common x-ray procedures: A preliminary study

Satharasinghe, DM; Jeyasugiththan, J; Pallewatte, AS; Wanninayake, WMNMB (Asia-Oceania Congress of Medical Physics (AOCMP), 2020)

Ionizing radiation is an essential tool in medical diagnosis and it brings great benefit to the patient. However, the associated risks due to the radiation are unavoidable. Therefore, close monitoring of radiation exposure ...
Evaluation of Entrance Surface Dose (ESD) for Chest, lumbar Spine and Abdomen Xray Procedures in a Selected Hospital in Sri Lanka

Ehalagasthanna, G. P. N. T.; Satharasinghe, D. M.; Hishaam, U. N.; Jeyasugiththan, Jeyasingam (University of Colombo, 2021)

Ionizing radiation is harmful to living beings because it can break apart biologically important molecules such as DNA. Therefore, it is important to enforce radiation protection where radiation is used in medical diagnosis ...
Computed Tomography Dose Reference Levels for head, chest and abdomen regions: A nationwide survey

Amalaraj, T; Satharasinghe, DM; Pallewatte, AS; Jeyasugiththan, Jeyasingam (The 21st Asia-Oceania Congress of Medical Physics (AOCMP -2021), 2021)

Introduction: The computed tomography (CT) is identified as the highest contributor of the population radiation dose among medical radiation examinations. Therefore, routine monitoring of the delivered radiation dose is ...
Estimation of Effective Radiation Dose in 16 Slice Computed Tomography Neck Examination

Gunawardhana, Harshana; Mallikaarachchi, Asanka; Viswakula, Sameera; Jeyasugiththan, Jeyasingam (Faculty of Science, University of Colombo, Sri Lanka, 2021)

Computed Tomography (CT) is the most essential imaging technique and widely used in various diagnostic radiological and interventional procedures in Sri Lanka. Because of the increased demand for CT imaging procedures, ...
Gender-wise Variation in the Delivered Radiation Dose during Common X-ray Procedures. A Preliminary Study

Satharasinghe, DM; Wanninayake, WMNMB; Pallewatte, AS; Jeyasugiththan, J (General Sir John Kotelawala Defence University, KDU, 2021)

The increased radiosensitivity in women compared to men is a greater concern in diagnostic radiology, which uses ionization radiation for the purpose of diagnosis. However, radiation protection authorities, such as the ...
Establishment of regional diagnostic reference levels for digital mammography in Western Province of Sri Lanka

Niroshani, H.S.; Jeyasugiththan, Jeyasingam; Senanayake, G.; Negishi, Toru (2021)

The radiation dose to the breasts should be kept to a minimum as breast tissues are highly sensitive to radiation. In mammography, the mean glandular dose (MGD) is used to specify the patient dose. In this study, data on ...
Paediatric diagnostic reference levels in computed tomography: a systematic review

Satharasinghe, D.M.; Jeyasugiththan, Jeyasingam; Wanninayake, W.M.N.M.B.; Pallewatte, A.S. (2021)

This study aims to review the existing literature on diagnostic reference levels (DRLs) in paediatric computed tomography (CT) procedures and the methodologies for establishing them. A comprehensive literature search was ...
Optimizing Image Noise as a means to improve Computed Tomography ATCM in Sri Lanka

Hishaam, H; Jeyasugiththan, Jeyasingam; Pallewatte, AS; Peterson, S (The 21st Asia-Oceania Congress of Medical Physics (AOCMP -2021), 2021)

The use of automatic tube current modulation (ATCM) during CT scans has become widely popular over the past few years. This method significantly reduces patient dose by adapting the tube current during a CT scan to produce ...
Effective Radiation Doses for Head and Neck Multi-Slice Computed Tomography (MSCT) Protocols

Karunarathna, Sanjaya; Satharasinghe, D.M; Hishaam, Urshella; Pallewatte, Aruna; Jeyasugiththan, Jeyasingam (Faculty of Science, University of Colombo, Sri Lanka, 2021)

Computed tomography (CT) is known as a standard imaging modality prescribed for head and neck diagnostic imaging. The introduction of multi-detector row CT (MDCT) has enabled imaging of the entire neck region within 2-4 ...
Validation of Geant4 Monte Carlo Model of 60Co High Dose Rate BEBIG Brachytherapy Source

Jayakody, M.; Jeyasugiththan, J.; Chougule, A. (University of Colombo, 2021)

The 60Co sources are widely used for high dose rate (HDR) brachytherapy treatments. The purpose of this study is to validate a Geant4 (version10.7.1) computational model of the BEBIG 60Co HDR source. The Geant4 Monte ...
Validation of Geant4 Monte Carlo Model of 60Co High Dose Rate BEBIG Brachytherapy Source

Jayakody, M; Jeyasugiththan, Jeyasingam; Chougule, Arun (Faculty of Science, University of Colombo, Sri Lanka, 2021)

The 60Co sources are widely used for high dose rate (HDR) brachytherapy treatments. The purpose of this study is to validate a Geant4 (version10.7.1) computational model of the BEBIG 60Co HDR source. The Geant4 Monte Carlo ...
Evaluation of Entrance Surface Dose (ESD) for Chest, Lumbar Spine and Abdomen X-ray Procedures in a Selected Hospital in Sri Lanka

Ehalagasthanna, G. P. N. T; Satharasinghe, D.M; Hishaam, U.N; Jeyasugiththan, Jeyasingam (Faculty of Science, University of Colombo, Sri Lanka, 2021)

Ionizing radiation is harmful to living beings because it can break apart biologically important molecules such as DNA. Therefore, it is important to enforce radiation protection where radiation is used in medical diagnosis ...
Measuring prompt gamma-ray emissions from elements found in tissue during passive-beam proton therapy

Jeyasugiththan, Jeyasingam; Camero, Jaime Nieto; Symons, Julyan; Jones, Pete; Buffler, Andy; Geduld, Dieter; Peterson, Stephen W (2021)

Prompt gamma detection during proton radiotherapy for range verification purposes will need to operate in both active and passive treatment beam environments. This paper describes prompt gamma measurements using a high ...
Influence Of The Average Adult Definition On International DRL Comparison And Optimization

Satharasinghe, DM; Wanninayake, WMNMB; Pallewatte, AS; Jeyasugiththan, Jeyasingam (The 21st Asia-Oceania Congress of Medical Physics (AOCMP -2021), 2021)

Introduction: The diagnostic reference levels (DRL) can be used to identify the appropriate level of exposure for a given X-ray procedure. The DRL also defined per standard patient or phantom to limit the effect of patient ...
Establishment of Institutional Diagnostic Reference Levels (DRLs) for Computed Tomography in National Hospital of Sri Lanka

Hettiarachchi, K. S.; Jeyasugiththan, J.; Pallewatte, A. S. (University of Colombo, 2022)

The institutional DRLs for the National Hospital of Sri Lanka were established by considering the most frequent computed tomography (CT) examination performed by three CT units in the Department of Radiology. CT dose volume ...
Dosimetric Comparison of Intensity Modulated Radiation Therapy and Volumetric Modulated Arc Therapy for Treatments of Thyroid Cancer

Banneheka, B. M. A. T.; Jeyasugiththan, J.; Kumara, K. V. A. W. (University of Colombo, 2022)

This study aims to compare volumetric modulated arc therapy (VMAT) treatment techniques against intensity modulated radiation therapy (IMRT). Planning target volume coverage, doses to the organs at risk, dose to the normal ...

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