1
|
Dhas N, Kudarha R, Tiwari R, Tiwari G, Garg N, Kumar P, Kulkarni S, Kulkarni J, Soman S, Hegde AR, Patel J, Garkal A, Sami A, Datta D, Colaco V, Mehta T, Vora L, Mutalik S. Recent advancements in nanomaterial-mediated ferroptosis-induced cancer therapy: Importance of molecular dynamics and novel strategies. Life Sci 2024; 346:122629. [PMID: 38631667 DOI: 10.1016/j.lfs.2024.122629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 03/04/2024] [Accepted: 04/10/2024] [Indexed: 04/19/2024]
Abstract
Ferroptosis is a novel type of controlled cell death resulting from an imbalance between oxidative harm and protective mechanisms, demonstrating significant potential in combating cancer. It differs from other forms of cell death, such as apoptosis and necrosis. Molecular therapeutics have hard time playing the long-acting role of ferroptosis induction due to their limited water solubility, low cell targeting capacity, and quick metabolism in vivo. To this end, small molecule inducers based on biological factors have long been used as strategy to induce cell death. Research into ferroptosis and advancements in nanotechnology have led to the discovery that nanomaterials are superior to biological medications in triggering ferroptosis. Nanomaterials derived from iron can enhance ferroptosis induction by directly releasing large quantities of iron and increasing cell ROS levels. Moreover, utilizing nanomaterials to promote programmed cell death minimizes the probability of unfavorable effects induced by mutations in cancer-associated genes such as RAS and TP53. Taken together, this review summarizes the molecular mechanisms involved in ferroptosis along with the classification of ferroptosis induction. It also emphasized the importance of cell organelles in the control of ferroptosis in cancer therapy. The nanomaterials that trigger ferroptosis are categorized and explained. Iron-based and noniron-based nanomaterials with their characterization at the molecular and cellular levels have been explored, which will be useful for inducing ferroptosis that leads to reduced tumor growth. Within this framework, we offer a synopsis, which traverses the well-established mechanism of ferroptosis and offers practical suggestions for the design and therapeutic use of nanomaterials.
Collapse
Affiliation(s)
- Namdev Dhas
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Ritu Kudarha
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Ruchi Tiwari
- Pranveer Singh Institute of Technology (Pharmacy), Kalpi road, Bhauti, Kanpur 208020, Uttar Pradesh, India
| | - Gaurav Tiwari
- Pranveer Singh Institute of Technology (Pharmacy), Kalpi road, Bhauti, Kanpur 208020, Uttar Pradesh, India
| | - Neha Garg
- Department of Medicinal Chemistry, Faculty of Ayurveda, Institute of Medical Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Praveen Kumar
- Department of Medicinal Chemistry, Faculty of Ayurveda, Institute of Medical Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Sanjay Kulkarni
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Jahnavi Kulkarni
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Soji Soman
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Aswathi R Hegde
- Faculty of Pharmacy, M S Ramaiah University of Applied Sciences, New BEL Road, MSR Nagar, Bangalore 560054, Karnataka, India
| | | | - Atul Garkal
- Department of Pharmaceutics, Institute of Pharmacy, Nirma University, Ahmedabad, Gujarat 382481, India; Center for Nanomedicine at the Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA; Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Anam Sami
- Department of Pharmaceutics, Institute of Pharmacy, Nirma University, Ahmedabad, Gujarat 382481, India
| | - Deepanjan Datta
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Viola Colaco
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India
| | - Tejal Mehta
- Department of Pharmaceutics, Institute of Pharmacy, Nirma University, Ahmedabad, Gujarat 382481, India
| | - Lalitkumar Vora
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, United Kingdom
| | - Srinivas Mutalik
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education (MAHE), Manipal 576104, Karnataka, India.
| |
Collapse
|
2
|
Datta D, Priyanka Bandi S, Colaco V, Dhas N, Siva Reddy DV, Vora LK. Fostering the unleashing potential of nanocarriers-mediated delivery of ocular therapeutics. Int J Pharm 2024:124192. [PMID: 38703931 DOI: 10.1016/j.ijpharm.2024.124192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 04/21/2024] [Accepted: 04/30/2024] [Indexed: 05/06/2024]
Abstract
Ocular delivery is the most challenging aspect in the field of pharmaceutical research. The major hurdle for the controlled delivery of drugs to the eye includes the physiological static barriers such as the complex layers of the cornea, sclera and retina which restrict the drug from permeating into the anterior and posterior segments of the eye. Recent years have witnessed inventions in the field of conventional and nanocarrier drug delivery which have shown considerable enhancement in delivering small to large molecules across the eye. The dynamic challenges associated with conventional systems include limited drug contact time and inadequate ocular bioavailability resulting from solution drainage, tear turnover, and dilution or lacrimation. To this end, various bioactive-based nanosized carriers including liposomes, ethosomes, niosomes, dendrimer, nanogel, nanofibers, contact lenses, nanoprobes, selenium nanobells, nanosponge, polymeric micelles, silver nanoparticles, and gold nanoparticles among others have been developed to circumvent the limitations associated with the conventional dosage forms. These nanocarriers have been shown to achieve enhanced drug permeation or retention and prolong drug release in the ocular tissue due to their better tissue adherence. The surface charge and the size of nanocarriers (10-1000 nm) are the important key factors to overcome ocular barriers. Various nanocarriers have been shown to deliver active therapeutic molecules including timolol maleate, ampicillin, natamycin, voriconazole, cyclosporine A, dexamethasone, moxifloxacin, and fluconazole among others for the treatment of anterior and posterior eye diseases. Taken together, in a nutshell, this book chapter provides a comprehensive perspective on the numerous facets of ocular drug delivery with a special focus on bioactive nanocarrier-based approaches, including the difficulties and constraints involved in the fabrication of nanocarriers. This also provides the detailed invention and applications of nanocarriers for the ophthalmic delivery of therapeutics.
Collapse
Affiliation(s)
- Deepanjan Datta
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India.
| | - Sony Priyanka Bandi
- Loka Laboratories Private Limited, Technology Business Incubator, BITS Pilani Hyderabad Campus, Jawahar Nagar, Medchal 500078, Telangana, India.
| | - Viola Colaco
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India
| | - Namdev Dhas
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India
| | - D V Siva Reddy
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio TX78227, USA
| | - Lalitkumar K Vora
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, U.K
| |
Collapse
|
3
|
Raut S, Azheruddin M, Kumar R, Singh S, Giram PS, Datta D. Lecithin Organogel: A Promising Carrier for the Treatment of Skin Diseases. ACS Omega 2024; 9:9865-9885. [PMID: 38463343 PMCID: PMC10918684 DOI: 10.1021/acsomega.3c05563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 01/26/2024] [Accepted: 02/01/2024] [Indexed: 03/12/2024]
Abstract
Skin is the largest organ of the human body, as it protects the body from the external environment. Nowadays, skin diseases and skin problems are more common, and millions of people are affected daily. Skin diseases are due to numerous infectious pathogens or inflammatory conditions. The increasing demand for theoretical research and practical applications has led to the rising prominence of gel as a semisolid material. To this end, organogels has been widely explored due to their unique composition, which includes organic solvents and mineral or vegetable oils, among others. Organogels can be described as semisolid systems wherein an organic liquid phase is confined within a three-dimensional framework consisting of self-assembled, cross-linked, or entangled gelator fibers. These gels have the ability to undergo significant expansion and retain substantial amounts of the liquid phase, reaching up to 99% swelling capacity. Furthermore, they respond to a range of physical and chemical stimuli, including temperature, light, pH, and mechanical deformation. Notably, due to their distinctive properties, they have aroused significant interest in a variety of practical applications. Organogels favor the significant encapsulation and enhanced permeation of hydrophobic molecules when compared with hydrogels. Accordingly, organogels are characterized into lecithin organogels, pluronic lecithin organogels, sorbitan monostearate-based organogels, and eudragit organogels, among others, based on the nature of their network and the solvent system. Lecithin organogels contain lecithin (natural and safe as a living cell component) as an organogelator. It acts as a good penetration enhancer. In this review, first we have summarized the fundamental concepts related to the elemental structure of organogels, including their various forms, distinctive features, methods of manufacture, and diverse applications. Nonetheless, this review also sheds light on the delivery of therapeutic molecules entrapped in the lecithin organogel system into deep tissue for the management of skin diseases and provides a synopsis of their clinical applications.
Collapse
Affiliation(s)
- Sushil Raut
- Department
of Pharmaceutics, Dr. DY Patil Institute
of Pharmaceutical Sciences and Research, Pimpri, Pune, Maharashtra 411018, India
| | - Mohammed Azheruddin
- Department
of Pharmaceutics, Dr. DY Patil Institute
of Pharmaceutical Sciences and Research, Pimpri, Pune, Maharashtra 411018, India
| | - Rajeev Kumar
- Lloyd
Institute of Management and Technology, Plot No. 11, Knowledge Park-II, Greater Noida, Uttar Pradesh 201306, India
| | - Shivani Singh
- Lloyd
Institute of Management and Technology, Plot No. 11, Knowledge Park-II, Greater Noida, Uttar Pradesh 201306, India
| | - Prabhanjan S. Giram
- Department
of Pharmaceutics, Dr. DY Patil Institute
of Pharmaceutical Sciences and Research, Pimpri, Pune, Maharashtra 411018, India
- Department
of Pharmaceutical Sciences, University at
Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Deepanjan Datta
- Department
of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| |
Collapse
|
4
|
Engineer R, Datta D, Gudi S, Krishnatry R, deSouza A, Ankathi SK, Kohle S, Saklani A. Dose Escalation Using Magnetic Resonance Guided High-Dose-Rate Endorectal Brachytherapy to Enhance Clinical Response after Neoadjuvant Radiotherapy in Rectal Adenocarcinoma. Int J Radiat Oncol Biol Phys 2023; 117:e295. [PMID: 37785083 DOI: 10.1016/j.ijrobp.2023.06.2304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) To assess the proportion of patients with rectal adenocarcinoma achieving clinical complete response after neoadjuvant chemoradiation (NACTRT) and MR guided endorectal brachytherapy boost (MR-ERBT) MATERIALS/METHODS: Patients with rectal cancers (T2-T4/N0-N+) treated with concurrent chemoradiotherapy (50Gy/25# with Capecitabine) between June-2017 to April-2022. Post RT, patients having residual non-circumferential lesions <8cm in length were administered escalated-dose MR-ERBT with Ir192 HDR source. A median dose of 12Gy (8-15Gy) in 3 (2-3) fractions at 3-5 day intervals was delivered using MR-ERBT after external radiation. Data on near complete/complete clinical response (nCR/cCR) rates, local regrowth rates and clinical outcome were collected for analysis. RESULTS Of the 145 patients who received MR-ERBT, majority were staged as T3(78.7%) and N1-2 (77.5%) rectal cancers. Median tumor length was 4cm and 123 (85%) of the tumors were located in the lower rectum (0-5cm from anal verge). Seventy-six (52%) patients achieved cCR or nCR (37 cCR, 39 nCR) and were advised observation or watch and wait (WW) management. The 69 patients having partial response were advised surgery. The patients having nCR 16 (29%) underwent resection, of these 10 (62%) had pathological complete response (pCR). The patients with partial or poor response, 57 underwent resection and of these 11 (19%) had pCR, 12 patients refused surgery due to fear of permanent stoma and continued to be on follow up. Of the 79 patients undergoing resection, 36 (45.5%) had sphincter preserving surgeries. At the median follow up of 30 months, local regrowth was seen in 8 (10.5%) of patients on WW and 6 were surgically salvaged while other 2 had synchronous metastatic relapse. Thus, 56 (41%) achieved organ preservation and continued to be on WW management. Twelve (8,2%) patients developed distant metastasis in the entire cohort, 3 in the WW group and 9 in the resected group. There were no pelvic recurrences seen in the resected patients. The disease-free survival at 3 years were (96.1% vs 89% Observation vs. resected (p_0.05) respectively. The overall survival at 3 years were (93% vs 98% Observation vs. resected (p_0.44) respectively. Late rectal toxicity was observed in 16(11%) patients on observation CONCLUSION: Dose Escalated MR-EBRT is an effective and safe method to enhance complete clinical response, thus improving the rate of organ preservation for distal rectal cancers.
Collapse
Affiliation(s)
- R Engineer
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - D Datta
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - S Gudi
- Tata Memorial Centre, Mumbai, India
| | - R Krishnatry
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - A deSouza
- Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - S K Ankathi
- Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| | - S Kohle
- Tata Memorial Centre, Mumbai, Maharashtra, India
| | - A Saklani
- Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India
| |
Collapse
|
5
|
Bandi SP, Datta D, Venuganti VVK. Hydrocaffeic acid-chitosan coating of gastric patch provides long-acting mucoadhesive delivery of model chemotherapeutic agent. Int J Pharm 2023; 631:122504. [PMID: 36529359 DOI: 10.1016/j.ijpharm.2022.122504] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/11/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
The development of a long-acting orally administered dosage form is a challenge. Here, we report development of a multi-layered mucoadhesive gastric patch that could deliver entrapped chemotherapeutic agent for eight days after oral administration. The multi-layered patch was designed to contain core layer, mucoadhesive layer and backing layer. The core layer contained the model chemotherapeutic agent, regorafenib. The mucoadhesive layer made of chitosan-hydrocaffeic acid conjugate showed greatest mucoadhesion strength of 18.1 ± 0.78 kPa in freshly excised rat gastric mucosa. The backing layer made of hydrophobic polycaprolactone-polydimethylsiloxane composite showed the contact angle of 120 ± 4.7° after placement of water drop. The entrapped regorafenib predominantly released from the mucoadhesive-side of the patch into simulated gastric fluid and showed a zero-order release profile. The patches were found to be stable for desired characteristics for up to 3 months in long term storage conditions. The pharmacokinetic studies in rat model revealed constant plasma concentration of regorafenib sustained for 8 days after oral administration of gastric patch. The gastric tissue where the patch adhered for 8 days did not show any significant histological changes compared with the normal gastric tissue. The oral administration of single dose of regorafenib-loaded gastric patch in FaDu cell xenografted tumor bearing athymic nude mice has shown significant (P < 0.05) reduction in the tumor volume over 7 days compared to the control group. Taken together, the multi-layered mucoadhesive gastric patch can be developed as a long-acting oral drug delivery system.
Collapse
Affiliation(s)
- Sony Priyanka Bandi
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India
| | - Deepanjan Datta
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India
| | - Venkata Vamsi Krishna Venuganti
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India.
| |
Collapse
|
6
|
Sarkar A, Dhar S, Bera S, Chakravarti M, Verma A, Prasad P, Saha A, Bhuniya A, Guha I, Roy S, Banerjee S, Baral R, Datta D, Bose A. 213P Type-1 diabetes restricts melanoma growth by reprogramming intra-tumoral T cell metabolism. Immuno-Oncology and Technology 2022. [DOI: 10.1016/j.iotech.2022.100324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
7
|
Engineer R, Datta D, Saklani A, deSouza A, Baheti A, Ankathi S, Krishnatry R, Gudi S, Patil P. Reduction of Tumor Length by >50%, Post Neoadjuvant Chemoradiation as a Predictor for Complete Response and Organ Preservation in Rectal Cancer. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
8
|
Pascual Reguant L, Tian T, Datta D, Cianferoni D, Kourtis S, Gañez-Zapater A, Cannatá C, Serra-Camprubi Q, Espinar L, Guirola M, Querol J, Miró-Canturri A, Arribas J, Serrano L, Peiró S, Sdelci S. Interactions between BRD4 short, LOXL2, and MED1 drive cell cycle transcription in triple-negative breast cancer. Eur J Cancer 2022. [DOI: 10.1016/s0959-8049(22)00966-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
9
|
Proud D, Datta D, Ketchell I, Douglas M, Manning DE, Addy C, Lau D, Duckers J. P160 “Seeing a trend” - increasing vitamin A levels on elexacaftor/tezacaftor/ivacaftor therapy. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)00491-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
10
|
Datta D, Roy G, Garg P, Venuganti VVK. Ocular delivery of cyclosporine A using dissolvable microneedle contact lens. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
11
|
Basu P, Sarangapani R, Datta D, Venkatraman B. Optimization Studies of Elemental Composition of Composite Polymer for Neutron Shielding Using Factorial Design Analysis. NUCL TECHNOL 2022. [DOI: 10.1080/00295450.2021.2018275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Pew Basu
- Indira Gandhi Centre for Atomic Research, Safety, Quality & Resource Management Group, Kalpakkam, Tamilnadu–603102, India
- Homi Bhabha National Institute, Kalpakkam, Tamilnadu–603102, India
| | - R. Sarangapani
- Indira Gandhi Centre for Atomic Research, Safety, Quality & Resource Management Group, Kalpakkam, Tamilnadu–603102, India
| | - D. Datta
- SRM Institute of Science & Technology, Department of Mathematics, Kattankulathur, Tamilnadu–603203, India
| | - B. Venkatraman
- Indira Gandhi Centre for Atomic Research, Safety, Quality & Resource Management Group, Kalpakkam, Tamilnadu–603102, India
- Homi Bhabha National Institute, Kalpakkam, Tamilnadu–603102, India
| |
Collapse
|
12
|
Ranjan A, Shukla S, Datta D, Misra R. Generating novel molecule for target protein (SARS-CoV-2) using drug-target interaction based on graph neural network. Netw Model Anal Health Inform Bioinform 2021; 11:6. [PMID: 34956815 PMCID: PMC8683294 DOI: 10.1007/s13721-021-00351-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/26/2021] [Accepted: 12/03/2021] [Indexed: 12/23/2022]
Abstract
The transmittable spread of viral coronavirus (SARS-CoV-2) has resulted in a significant rise in global mortality. Due to lack of effective treatment, our aim is to generate a highly potent active molecule that can bind with the protein structure of SARS-CoV-2. Different machine learning and deep learning approaches have been proposed for molecule generation; however, most of these approaches represent the drug molecule and protein structure in 1D sequence, ignoring the fact that molecules are by nature in 3D structure, and because of this many critical properties are lost. In this work, a framework is proposed that takes account of both tertiary and sequential representations of molecules and proteins using Gated Graph Neural Network (GGNN), Knowledge graph, and Early Fusion approach. The generated molecules from GGNN are screened using Knowledge Graph to reduce the search space by discarding the non-binding molecules before being fed into the Early Fusion model. Further, the binding affinity score of the generated molecule is predicted using the early fusion approach. Experimental result shows that our framework generates valid and unique molecules with high accuracy while preserving the chemical properties. The use of a knowledge graph claims that the entire generated dataset of molecules was reduced by roughly 96% while retaining more than 85% of good binding desirable molecules and the rejection of more than 99% of fruitless molecules. Additionally, the framework was tested with two of the SARS-CoV-2 viral proteins: RNA-dependent-RNA polymerase (RdRp) and 3C-like protease (3CLpro).
Collapse
Affiliation(s)
- Amit Ranjan
- Department of Computer Science and Engineering, Indian Institute of Technology Patna, Patna, 801103 India
| | - Shivansh Shukla
- Department of Computer Science and Engineering, Indian Institute of Technology Patna, Patna, 801103 India
| | - Deepanjan Datta
- Department of Computer Science and Engineering, Indian Institute of Technology Patna, Patna, 801103 India
| | - Rajiv Misra
- Department of Computer Science and Engineering, Indian Institute of Technology Patna, Patna, 801103 India
| |
Collapse
|
13
|
Duckers J, Fitzgerald R, Proud D, Addy C, Datta D. Forewarned is forearmed: The cardiovascular time bomb in Cystic Fibrosis. J Cyst Fibros 2021; 21:551-552. [PMID: 34903495 DOI: 10.1016/j.jcf.2021.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 11/12/2021] [Accepted: 11/15/2021] [Indexed: 10/19/2022]
Affiliation(s)
- J Duckers
- Cardiff and Vale University Health Board, Wales, United Kingdom.
| | | | - D Proud
- Cardiff and Vale University Health Board, Wales, United Kingdom
| | - C Addy
- Cardiff and Vale University Health Board, Wales, United Kingdom
| | - D Datta
- Cardiff and Vale University Health Board, Wales, United Kingdom
| |
Collapse
|
14
|
Datta D, Panchal DS, Venuganti VVK. Corrigendum to "Transdermal delivery of vancomycin hydrochloride: Influence of chemical and physical permeation enhancers" [Int. J. Pharm. 602 (2021) 120663]. Int J Pharm 2021; 609:121171. [PMID: 34635371 DOI: 10.1016/j.ijpharm.2021.121171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Deepanjan Datta
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India
| | - Dhruvisha Sureshbhai Panchal
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India
| | - Venkata Vamsi Krishna Venuganti
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India.
| |
Collapse
|
15
|
Datta D, Panchal DS, Venuganti VVK. Transdermal delivery of vancomycin hydrochloride: Influence of chemical and physical permeation enhancers. Int J Pharm 2021; 602:120663. [PMID: 33933644 DOI: 10.1016/j.ijpharm.2021.120663] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/18/2021] [Accepted: 04/26/2021] [Indexed: 02/03/2023]
Abstract
Topical and transdermal delivery of vancomycin hydrochloride (VH), a broad-spectrum peptide antibiotic, is a challenge because of its high molecular weight (1485.7 Da) and hydrophilicity (log P -3.1). The objective of this study was to investigate the feasibility of delivering VH into and across the skin using permeation enhancement techniques. Skin permeation studies were performed using Franz diffusion cell apparatus in the excised porcine skin model. The influence of co-treatment and pre-treatment of chemical permeation enhancers (oleic acid and palmitic acid) on permeation of VH across intact and tape-stripped skin was evaluated. In addition, continuous anodal iontophoresis was applied to enhance the skin permeation of VH. The mechanism of skin permeation enhancement by palmitic acid was investigated using FTIR spectroscopy, impedance spectroscopy, and thermal analysis techniques. Pharmacokinetic analysis was performed after the topical application of VH formulations in Sprague Dawley rats. Results from permeation studies showed that VH did not passively permeate across the intact skin after 48 h, whereas the cumulative amount of VH permeated across the tape-stripped skin was found to be 854 ± 67 µg/cm2. A combination of tape-stripping and chemical enhancers resulted in enhancing the cumulative amount of VH permeated across the skin by 2- and 10-fold with oleic acid and palmitic acid application, respectively. Similarly, 2 and 12 h pre-treatment of tape-stripped skin with palmitic acid enhanced the flux of VH across the skin by 1.7- and 5-fold, respectively. It was found that tape-stripping and the palmitic acid application would provide greater VH permeation compared with 0.31 mA/cm2 iontophoresis application. Thermal analysis and impedance spectroscopic analysis showed that palmitic acid interacts with epidermal lipids to enhance VH permeation. Pharmacokinetic analysis after topical application showed that the Cmax and mean residence time increased by 3-fold with the application of VH and palmitic acid on tape-stripped skin compared with free VH on intact skin. Taken together, VH can be delivered through the topical route using a combination of chemical enhancer and tape-stripping to treat local and systemic bacterial infections.
Collapse
Affiliation(s)
- Deepanjan Datta
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India
| | - Dhruvisha Sureshbhai Panchal
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India
| | - Venkata Vamsi Krishna Venuganti
- Department of Pharmacy, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, Telangana State, India.
| |
Collapse
|
16
|
Chaudhary RK, Kumar R, Sharma SD, Datta D. Computation of epistemic uncertainty due to limited data samples in small field dosimetry using Fuzzy Set Theory. Br J Radiol 2021; 94:20190561. [PMID: 33684311 DOI: 10.1259/bjr.20190561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To estimate the epistemic (or fuzzy) uncertainty, arising due to limited data samples in the measurement of the output factors (OFs) of the small fields using Fuzzy Set Theory (FST). METHODS EBT3 film samples of size 50 × 50 mm2 were used for the measurement of the OF of stereotactic radiosurgery (SRS) cones of size 4, 6, 7.5, 10, 12.5 and 15 mm diameter, normalized with respect to the output of 100 × 100 mm2 open field size. Three measurements were done per cone/field size. Red color channel was chosen for the dosimetry purpose, net optical density (NOD) was converted to the dose using non-linear relation. To estimate the epistemic uncertainty associated with the measured OFs due to limited number of data samples, a triangular fuzzy number (TFN) was assumed as the fuzziness in the dose delivered by the individual SRS cone/field. Uncertainty in the OF was estimated by applying the Fuzzy Vertex Method (FVM). The membership functions of the OF were constructed for each cone size and the nature of the uncertainty in the OF of the cones was expressed in the terms of its fuzziness. For the sake of completeness of the study, the statistical uncertainty involved in the procedure has also been calculated. RESULTS The statistical and fuzzy uncertainties in the measurement of OF of cones range from 3.28 to 6.25% and 2.58 to 5.44% respectively. The smallest cone of 4 mm has the largest values of statistical and fuzzy uncertainties. The membership functions of the OF for the studied cones were triangular in nature. CONCLUSION The epistemic uncertainty arising due to limited number of data samples holds a significant fraction of the prescribed dose, and therefore, should not be ignored in the total uncertainty estimation. ADVANCES IN KNOWLEDGE This study highlights the significance of epistemic component of measurement uncertainty arising out due to the insufficient/limited number of measurements of a quantity.
Collapse
Affiliation(s)
- Rahul Kumar Chaudhary
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Rajesh Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India
| | - S D Sharma
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India.,Homi Bhabha National Institute, Mumbai, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India.,Homi Bhabha National Institute, Mumbai, India
| |
Collapse
|
17
|
Ziaj S, Tseliou F, Datta D, Abbott RA. Skin cancer awareness and prevention behaviour in Wales. Br J Dermatol 2020; 184:764-765. [PMID: 33179262 DOI: 10.1111/bjd.19676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 11/28/2022]
Affiliation(s)
- S Ziaj
- Department of Dermatology, University Hospital Wales, Cardiff, UK
| | - F Tseliou
- HealthWise Wales, Division of Population Medicine, Cardiff University, UK
| | - D Datta
- Department of Biochemistry, Cardiff and Vale University Health Board, Cardiff, UK
| | - R A Abbott
- Department of Dermatology, University Hospital Wales, Cardiff, UK
| |
Collapse
|
18
|
Agarwal TK, Sahoo BK, Shetty T, Gaware JJ, Kumara S, Karunakara N, Sapra BK, Datta D. Numerical simulation of 222Rn profiling in an experimental chamber using CFD technique. J Environ Radioact 2020; 220-221:106298. [PMID: 32560887 DOI: 10.1016/j.jenvrad.2020.106298] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 03/03/2020] [Accepted: 05/03/2020] [Indexed: 06/11/2023]
Abstract
Measurement of indoor 222Rn concentration and interpretation of distribution patterns are important for inhalation dosimetry in occupational and residential areas. Experimental determination of 222Rn concentration distribution and estimation of inhalation doses depend on the underlying aspects such as calibration of the detectors, accuracy of the techniques etc. Therefore, 222Rn concentration distribution needs to be very well understood in a closed domain for the controlled studies. In the recent times, Computational fluid dynamics (CFD) technique has gained a lot of attention for the prediction and visualization of indoor 222Rn concentration profiles and their mixing ability in the domain. The present study aims to simulate the effect of forced mixing on the 222Rn concentration profile in a 22 m3 experimental chamber. This chamber is designed for carrying out the controlled experiments, calibration and inter-comparison studies of various types of 222Rn detectors. Effect of different parameters such as time, flow rates, fan-off and fan-on conditions have been studied on the transient response, extent of the air mixing patterns and subsequently on 222Rn concentration profile in the chamber. Further, Non uniformity index (NUI) is introduced as a measure of the uniformity of the distribution in the closed domain. NUI is estimated for different cases in order to efficiently interpret the effect of above mentioned parameters on 222Rn profile in the chamber. This study will be useful to represent the turbulent conditions in real indoor domains and occupational facilities as U-mines during calibration and inter-comparison exercises of different 222Rn detectors.
Collapse
Affiliation(s)
- Tarun K Agarwal
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - B K Sahoo
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Trilochana Shetty
- Centre for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, Mangalagangothri, Karnataka, 574199, India
| | - J J Gaware
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Sudeep Kumara
- Centre for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, Mangalagangothri, Karnataka, 574199, India
| | - N Karunakara
- Centre for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, Mangalagangothri, Karnataka, 574199, India
| | - B K Sapra
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| |
Collapse
|
19
|
Pradhan SM, Datta D, Pathan MS, Srivastava K, Selvam TP. ESTIMATION OF UNCERTAINTY IN MEASUREMENT OF DOSE EQUIVALENT AT LABORATORY LEVEL USING CASO4 :Dy-BASED TLD BADGE SYSTEM IN INDIA. Radiat Prot Dosimetry 2020; 188:135-147. [PMID: 31832666 DOI: 10.1093/rpd/ncz268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 07/20/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
The objective of this paper is to estimate the combined uncertainty in the measurement of dose equivalent at laboratory level using CaSO4:Dy-based thermoluminescent dosemeter badge system by including variations in the components of the system. The variability of performance of the system is analysed using random effects one way analysis of variance model. The model enables estimation of the overall variance of the performance of the sampled population. The population in the study comprises all possible indicated dose equivalents on irradiation of dosemeters to a specific dose equivalent and radiation quality. Coefficient of variation and combined uncertainty at 95% level of confidence in the measurement of Hp(10) due to S-Cs radiation quality are found to be 6.6 and 14.3%, respectively, at the dose level of 5.31 mSv. The above parameters in the measurement of in-use quantity, i.e. whole body dose or photon dose equivalent are found to be 7.4 and 16.4%, respectively. The performance of the monitoring system on relative response has been observed to be satisfactory. Various factors affecting the variability of performance of the system are identified for further improvement in coefficient of variation.
Collapse
Affiliation(s)
- S M Pradhan
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai 400 085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai 400 085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Munir S Pathan
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai 400 085, India
| | - Kshama Srivastava
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai 400 085, India
| | - T Palani Selvam
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai 400 085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| |
Collapse
|
20
|
Rout RP, Sahoo BK, Pal R, Dhabekar BS, Bakshi AK, Datta D. Investigation of 220Rn emanation and exhalation from soil samples of Larsemann Hills region, Antarctica. J Environ Radioact 2020; 214-215:106175. [PMID: 32063292 DOI: 10.1016/j.jenvrad.2020.106175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 01/08/2020] [Accepted: 01/20/2020] [Indexed: 06/10/2023]
Abstract
In the present study, thoron exhalation flux density were measured in the soil samples collected around the Indian station namely Bharati (69° 24.41' S, 76° 11.72' E) and its nearby islands in the Larsemann hills region of Antarctica. Further, dependency of thoron mass emanation rate and emanation coefficient on the soil grain size was studied by segregating the soil samples into four different grain size groups: 50-100 μm, 100-200 μm, 200-500 μm and 500-1000 μm which showed that both of them follow a decreasing trend with increase in grain size. A comparison of measured mass emanation rate between different soil samples showed that it had a larger variation for the smaller grain size which eventually decreased as grain size increased while emanation coefficient was observed to be nearly constant for all the grain size groups. The variation in emanation coefficient with respect to mean grain size has been investigated and an empirical exponential model has been proposed for predicting emanation coefficient for different grain sizes.
Collapse
Affiliation(s)
- R P Rout
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Mumbai, 400 094, India
| | - B K Sahoo
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - R Pal
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Mumbai, 400 094, India
| | - B S Dhabekar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - A K Bakshi
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| |
Collapse
|
21
|
Chattaraj A, Selvam TP, Datta D. MONTE CARLO-BASED INVESTIGATION OF MICRODOSIMETRIC DISTRIBUTION OF HIGH ENERGY BRACHYTHERAPY SOURCES. Radiat Prot Dosimetry 2019; 187:115-128. [PMID: 31165891 DOI: 10.1093/rpd/ncz148] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 04/26/2019] [Accepted: 05/09/2019] [Indexed: 06/09/2023]
Abstract
FLUKA-based Monte Carlo calculations were carried out to study microdosimetric distributions in air and in water for encapsulated high energy brachytherapy sources (60Co, 137Cs, 192Ir and 169Yb) by simulating a Tissue Equivalent Proportional Counter (Model LET1/2) having sensitive diameter of 1. 27 cm for a site size of 1 μm. The study also included microdosimetric distributions of bare sources. When the sources are in air, for a given source, the source geometry does not affect the y¯F and y¯D values significantly. When the encapsulated 192Ir, 137Cs and 60Co sources are in water, y¯F and y¯D values increase with distance in water which is due to degradation in the energy of photons. Using the calculated values of y¯D, relative biological effectiveness (RBE) was obtained for the investigated sources. When 60Co, 137Cs and 192Ir sources are in water, RBE increases from 1.03 ± 0.01 to 1.17 ± 0.01, 1.24 ± 0.01 to 1.46 ± 0.02 and 1.50 ± 0.01 to 1.75 ± 0.03, respectively, when the distance was increased from 3-15 cm, whereas for 169Yb, RBE is about 2, independent of distance in water.
Collapse
Affiliation(s)
- Arghya Chattaraj
- Radiological Physics & Advisory Division, Health, Safety & Environment Group, Bhabha Atomic Research Centre, Trombay, Mumbai
- Homi Bhabha National Institute, Anushaktinagar, Mumbai
| | - T Palani Selvam
- Radiological Physics & Advisory Division, Health, Safety & Environment Group, Bhabha Atomic Research Centre, Trombay, Mumbai
- Homi Bhabha National Institute, Anushaktinagar, Mumbai
| | - D Datta
- Radiological Physics & Advisory Division, Health, Safety & Environment Group, Bhabha Atomic Research Centre, Trombay, Mumbai
- Homi Bhabha National Institute, Anushaktinagar, Mumbai
| |
Collapse
|
22
|
Pathan MS, Pradhan SM, Datta D, Selvam TP. STUDY OF EFFECT OF CONSECUTIVE HEATING ON THERMOLUMINESCENCE GLOW CURVES OF MULTI-ELEMENT TL DOSEMETER IN HOT GAS-BASED READER SYSTEM. Radiat Prot Dosimetry 2019; 187:509-517. [PMID: 31650175 DOI: 10.1093/rpd/ncz191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/17/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
The objective of this paper is to study the effect of consecutive heating of TL elements of a thermoluminescence dosemeter (TLD) card in hot N2 gas-based TLD badge reader. The effect is studied by theoretical simulations of clamped heating profiles of the discs and resulting TL glow curves. The simulated temperature profile accounts for heat transfer to disc from hot gas as well as radiative and convective heat exchanges between the disc and the surrounding. The glow curves are simulated using 10 component glow peak model for CaSO4:Dy using the simulated temperature profile. The shape of the simulated glow curves and trend in total TL signal of the three discs were observed to match closely with the experimental observations when elevated surrounding temperature was considered for simulation. It is concluded that the readout (heating) of adjacent TLD disc affects the surrounding temperature leading to the changes in temperature profile of the next disc.
Collapse
Affiliation(s)
- Munir S Pathan
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai, 400 085, India
| | - S M Pradhan
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai, 400 085, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai, 400 085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India
| | - T Palani Selvam
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai, 400 085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India
| |
Collapse
|
23
|
Vandana S, Bakshi AK, Behrens R, Chattaraj A, Saxena SK, Dhami PS, Panja S, Jagasia P, Selvam TP, Dash A, Datta D. MEASUREMENT OF OPERATIONAL QUANTITIES Hp(0.07) AND Hp(3) FOR INDIGENOUSLY DEVELOPED 106Ru/106Rh SOURCE USING AN EXTRAPOLATION CHAMBER. Radiat Prot Dosimetry 2019; 185:376-386. [PMID: 30916771 DOI: 10.1093/rpd/ncz024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/02/2019] [Accepted: 02/19/2019] [Indexed: 06/09/2023]
Abstract
In the present study, a prototype 106Ru/106Rh source was fabricated using high level liquid waste from reactor fuel, fixed in a stainless steel housing with a window and backing made of silver. The study involves measurement of the operational quantities Hp(0.07), Hp(3) and the percentage depth dose (PDD) using an extrapolation chamber. It also involves determination of necessary correction factors to arrive at Hp(0.07) and Hp(3) following International Organisation for Standardisation (ISO) and methods suggested in literature. The study facilitates incorporation of the 106Ru/106Rh source as a beta reference source for quality assurance programme in TLD personnel monitoring as per the guidelines of ISO.
Collapse
Affiliation(s)
- S Vandana
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - A K Bakshi
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai , India
| | - R Behrens
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, Braunschweig, Germany
| | - A Chattaraj
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - S K Saxena
- Radiopharmaceutical Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - P S Dhami
- Fuel Reprocessing Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - S Panja
- Fuel Reprocessing Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - P Jagasia
- Fuel Reprocessing Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - T Palani Selvam
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai , India
| | - A Dash
- Radiopharmaceutical Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - D Datta
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai , India
| |
Collapse
|
24
|
Chattaraj A, Selvam TP, Datta D. INVESTIGATION OF APPLICABILITY OF PURE PROPANE GAS FOR MICRODOSIMETRY AT NEUTRON FIELDS: A MONTE CARLO STUDY. Radiat Prot Dosimetry 2019; 185:74-86. [PMID: 30576567 DOI: 10.1093/rpd/ncy261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/01/2018] [Accepted: 11/23/2018] [Indexed: 06/09/2023]
Abstract
Applicability of pure propane gas for microdosimetric measurements in neutron fields was investigated using the FLUKA Monte Carlo code. Monoenergetic neutrons in the energy range 1 keV-20 MeV and the ISO-neutron sources such as 241Am-Be, 241Am-B, 252Cf and 252Cf + D2O were considered in the present study. The tissue-equivalent proportional counter (TEPC) simulated in the study was LET-1/2 (by Far West Technology) with site sizes 1, 2 and 8 μm. The study demonstrates that for a given site size, the TEPC filled with tissue-equivalent propane and pure propane gases produce similar microdosimetric distributions when the density of pure propane gas is lowered appropriately. For the ISO-neutron sources, the density of propane gas requires scaling by a factor 0.85. For the monoenergetic neutrons, depending upon the neutron energy, the values of scaling factors are in the range of 0.58-0.93.
Collapse
Affiliation(s)
- Arghya Chattaraj
- Radiological Physics and Advisory Division, Health, Safety and Environment Group, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| | - T Palani Selvam
- Radiological Physics and Advisory Division, Health, Safety and Environment Group, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| | - D Datta
- Radiological Physics and Advisory Division, Health, Safety and Environment Group, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| |
Collapse
|
25
|
Kakade NR, Kumar R, Sharma SD, Datta D. Equivalence of silver and gold nanoparticles for dose enhancement in nanoparticle-aided brachytherapy. Biomed Phys Eng Express 2019. [DOI: 10.1088/2057-1976/ab3d0c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
26
|
Bakshi A, Pal R, Dawn S, Dhabekar B, Datta D. Measurement of environmental radiation and analysis of microdosimetric spectra of cosmic rays during the 35th expedition to Indian station Bharati, Antarctica. RADIAT MEAS 2019. [DOI: 10.1016/j.radmeas.2019.106122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
27
|
Roy T, Sharma A, Datta D, Balasubramaniam R. Molecular dynamics simulation of single discharge and dimensionless correlation with actual material removal in micro electrical discharge machining. Molecular Simulation 2019. [DOI: 10.1080/08927022.2019.1626988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- T. Roy
- Homi Bhabha National Institute, Mumbai, India
| | - A. Sharma
- Homi Bhabha National Institute, Mumbai, India
| | - D. Datta
- Homi Bhabha National Institute, Mumbai, India
- Bhabha Atomic Research Centre, Mumbai, India
| | - R. Balasubramaniam
- Homi Bhabha National Institute, Mumbai, India
- Bhabha Atomic Research Centre, Mumbai, India
| |
Collapse
|
28
|
Sharma R, Sharma SD, Sarkar PS, Singh B, Agrawal AK, Datta D. Phantom-Based Feasibility Studies on Phase-Contrast Mammography at Indian Synchrotron Facility Indus-2. J Med Phys 2019; 44:39-48. [PMID: 30983770 PMCID: PMC6438051 DOI: 10.4103/jmp.jmp_98_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Introduction: Use of synchrotron radiation (SR) X-ray source in medical imaging has shown great potential for improving soft-tissue image contrast such as the breast. The present study demonstrates quantitative X-ray phase-contrast imaging (XPCI) technique derived from propagation-dependent phase change observed in the breast tissue-equivalent test materials. Materials and Methods: Indian synchrotron facility (Indus-2, Raja Ramanna Centre of Advanced Technology [RRCAT]) was used to carry out phantom feasibility study on phase-contrast mammography. Different phantoms and samples, including locally fabricated breast tissue-equivalent phantoms were used to perform absorption and phase mode imaging using 12 and 16 keV SR X-ray beam. Edge-enhancement index (EEI) and edge enhancement to noise ratio (EE/N) were measured for all the images. Absorbed dose to air values were calculated for 12 and 16 keV SR X-ray beam using the measured SR X-ray photon flux at the object plane and by applying the standard radiation dosimetry formalism. Results and Conclusion: It was observed in case of all the phantoms and test samples that EEI and EE/N values are relatively higher for images taken in the phase mode. The absorbed dose to air at imaging plane was found to be 75.59 mGy and 28.9 mGy for 12 and 16 keV SR energies, respectively. However, these dose values can be optimized by reducing the image acquisition time without compromising the image quality when clinical samples are imaged. This work demonstrates the feasibility of XPCI in mammography using 12 and 16 keV SR X-ray beams.
Collapse
Affiliation(s)
- Reena Sharma
- Division of Radiological Physics and Advisory, Bhabha Atomic Research Centre, CT and CRS, Mumbai, Maharashtra, India.,Department of Atomic Energy, Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | - S D Sharma
- Division of Radiological Physics and Advisory, Bhabha Atomic Research Centre, CT and CRS, Mumbai, Maharashtra, India.,Department of Atomic Energy, Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | - P S Sarkar
- Department of Atomic Energy, Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Division of Technical Physics, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India
| | - B Singh
- Division of Technical Physics, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India
| | - A K Agrawal
- Division of Technical Physics, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India
| | - D Datta
- Division of Radiological Physics and Advisory, Bhabha Atomic Research Centre, CT and CRS, Mumbai, Maharashtra, India.,Department of Atomic Energy, Homi Bhabha National Institute, Mumbai, Maharashtra, India
| |
Collapse
|
29
|
Sahoo S, Shrivastava V, Selvam TP, Bakshi AK, Kumar R, Rama P, Datta D, Chinnaesakki S, Saxena SK, Kumar Y, Dash A. Dosimetry of indigenously developed 177Lu patch source for surface brachytherapy-Experimental and Monte Carlo methods. J Radiol Prot 2019; 39:54-70. [PMID: 30523912 DOI: 10.1088/1361-6498/aaeeb6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This paper describes the evaluation of dosimetry characteristics of an in-house developed 177Lu skin patch source for treatment of non-melanoma skin cancer. A 177Lu skin patch source based on Nafion-115 membrane backbone containing 3.46 ± 0.01 mCi of activity was used. Activity measurement of the patch source was based on gamma ray spectrometry using a HPGe detector. The efficiencies of the HPGe detector were fitted using an orthogonal polynomial function. The absorbed dose rate to water at 5 μm depth in water was determined using an extrapolation chamber, EBT3 Gafchromic film and compared with Monte Carlo methods. The correction factors such as Bragg-Gray stopping power ratio of water-to-air and chamber wall material being different from water, needed to be applied on measurements for establishing the dose rate at 5 μm depth, were calculated using the Monte Carlo method. Absorbed dose rate at 5 μm depth in water (surface dose rate) measured using an extrapolation chamber and EBT3 Gafchromic film were 9.9 ± 0.7 and 8.2 ± 0.1 Gy h-1 mCi-1 respectively for the source activity of 3.46 ± 0.01 mCi. The surface dose rate calculated using the Monte Carlo method was 8.7 ± 0.2 Gy h-1 mCi-1, which agrees reasonably well with measurement. The measured dose rate per mCi offers scope for ascertaining treatment time required to deliver the dose for propitious therapeutic outcome. Additionally, on-axis depth dose and lateral dose profiles at 5 μm and 1 mm depth in water phantom were also calculated using the Monte Carlo method.
Collapse
Affiliation(s)
- Sridhar Sahoo
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Mumbai-400 085, India. Homi Bhabha National Institute, Mumbai-400 094, India
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Abstract
Purpose: The purpose of the present study was to evaluate the practicability of liquid ionization chamber (LIC) for pretreatment dose verification of the advanced radiotherapy techniques such as volumetric modulated arc therapy (VMAT). Materials and Methods: The dosimetric characteristics of LIC such as repeatability, sensitivity, monitor unit linearity, dose rate dependence, angular dependence, voltage-current response, and output factors were investigated in 6 MV therapeutic X-ray beams. The LIC was cross-calibrated against 0.125-cc air-filled thimble ionization chamber. A dedicated dosimetry insert made up of Perspex to incorporate the LIC at proper location in the intensity-modulated radiation therapy thorax phantom was locally fabricated. The collection efficiency and ion recombination correction factor was determined using the two-dose rate method. Pretreatment dose verification measurement of VMAT treatment plans were carried out using the liquid ionization chamber as well as small volume (0.125 cc) air-filled thimble ionization chamber. The measured dose values by the two dosimeters and TPS calculated dose at a given point were compared. Results: The relative percentage differences between the TPS calculated and measured doses were within ± 1.57% for LIC and ± 2.21% for 0.125 cc ionization chamber, respectively. Conclusions: The measured dose values by the two dosimeters and TPS calculated dose at a given point were found comparable suggesting that the LIC could be a good choice of dosimeter for pretreatment dose verification in VMAT.
Collapse
Affiliation(s)
- Nitin R Kakade
- Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Anushaktinagar, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai, Maharashtra, India
| | - Rajesh Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Anushaktinagar, Mumbai, Maharashtra, India
| | - Sunil Dutt Sharma
- Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Anushaktinagar, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai, Maharashtra, India
| | - Vikram Mittal
- Department of Radiotherapy, P. D. Hinduja National Hospital, Mumbai, Maharashtra, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Anushaktinagar, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai, Maharashtra, India
| |
Collapse
|
31
|
Chandrasekhar S, Pradhan SM, Bhattacharya M, Bakshi AK, Datta D. A new look at blind test procedures in personnel monitoring. Radiat Prot Environ 2019. [DOI: 10.4103/rpe.rpe_7_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
32
|
Sharma R, Sharma SD, Sarkar PS, Datta D. Imaging and Dosimetric Study on Direct Flat-Panel Detector-Based Digital Mammography System. J Med Phys 2018; 43:255-263. [PMID: 30636851 PMCID: PMC6299749 DOI: 10.4103/jmp.jmp_64_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 10/08/2018] [Accepted: 10/09/2018] [Indexed: 01/23/2023] Open
Abstract
INTRODUCTION Image quality of digital mammography system is generally defined by three primary physical parameters, namely, contrast, resolution, and noise. Quantification of these metrics can be done by measuring objective image quality parameters defined as contrast-to-noise ratio (CNR), modulation transfer function (MTF), and noise power spectra (NPS). MATERIALS AND METHODS In the present study, various imaging metrics such as CNR, contrast detail resolution, MTF, and NPS were evaluated for a direct flat-panel detector-based digital mammography system following the European Guidelines. Furthermore, system performance relating to both image quality and doses were evaluated using figure of merit (FOM) in terms of CNR2/mean glandular dose (MGD) under automatic exposure control (AEC) and clinically used OPDOSE operating mode. RESULTS AND CONCLUSION Under AEC mode, FOM values for the 4.5 cm thick BARC polymethyl methacrylate (PMMA) phantom were found to be 15.02, 15.88, and 19.82 at Mo/Mo, Mo/Rh, and W/Rh target/filter (T/F), respectively. Under OPDOSE mode, FOM values were found to 65.32, 11.80, and 1.14 for the BARC PMMA phantom thickness of 2, 4.5, and 8 cm, respectively. Under OPDOSE mode, the calculated MGD values for three Computerized Imaging Reference Systems slab phantoms having total thickness of 7 cm were observed to be 3.03, 2.32, and 1.75 mGy with glandular/adipose tissue compositions of 70/30, 50/50, and 30/70, respectively, whereas for the 2-8-cm thick BARC PMMA phantom, the calculated MGDs were found to be in the range of 0.57-3.32 mGy. All the calculated MGDs values were found to be lower than the acceptable level of dose limits provided in European Guidelines.
Collapse
Affiliation(s)
- Reena Sharma
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
- Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | - S. D. Sharma
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
- Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | - P. S. Sarkar
- Homi Bhabha National Institute, Mumbai, Maharashtra, India
- Technical Physics Division, Bhabha Atomic Research Centre (BARC), Mumbai, Maharashtra, India
| | - D. Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
- Homi Bhabha National Institute, Mumbai, Maharashtra, India
| |
Collapse
|
33
|
Datta D, Krishnababu K, Stroscio MA, Dutta M. Effect of quantum confinement on lifetime of anharmonic decay of optical phonons in semiconductor nanostructures. J Phys Condens Matter 2018; 30:355302. [PMID: 29972139 DOI: 10.1088/1361-648x/aad104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The anharmonic decay of phonons underlies many important effects in semiconductors, e.g. hotspot formation, phonon bottleneck and thermal resistivity. In this article, we evaluate the effect of quantum confinement on the anharmonic decay transition probability in a cubic isotropic material. This article focuses on the anharmonic decay of longitudinal optical phonons, generated from hot electrons, are directly related to formation of hotspots in the active region of semiconductor devices. The confinement effect has been realized in double interface heterostructure quantum well (DHSQW) (e.g. AlAs/GaAs/AlAs) and free-standing quantum well (FSQW) (e.g. GaAs) structures as the confined phonon modes have different properties inside the structures. The longitudinal-optical phonon decay rate is reduced for the case of a DHSQW compared to bulk material and for a FSQW the decay rate has a strong dependence on wavevector value of the three phonons involved.
Collapse
Affiliation(s)
- D Datta
- Department of Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, IL, United States of America
| | | | | | | |
Collapse
|
34
|
Madhumita B, Sneha C, Dipali V, Pradhan SM, Bakshi AK, Datta D, Tripathi SM, Singh SK. DEVELOPMENT OF AN ALGORITHM TO ESTIMATE EYE LENS DOSE IN TERMS OF OPERATIONAL QUANTITY Hp(3) USING HEAD TLD BADGE. Radiat Prot Dosimetry 2018; 178:364-373. [PMID: 28981726 DOI: 10.1093/rpd/ncx123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
In view of the recommendations of International Commission on Radiological Protection for reduction of the occupational annual dose limit for eye lens from 150 mSv to 20 mSv/y, questions have been raised on the adequacy of monitoring for the quantities Hp(10) and Hp(0.07). As an immediate requirement, in the present situation, where there is no exclusive eye lens dosemeter in India, the existing chest TLD badge was modified to be used as head badge (head dosemeter) by including a strap to enable wearing on the forehead. In order to estimate the eye lens dose in terms of the operational quantity Hp(3), the prevalent algorithm of chest badge was also modified. The modified algorithm was applied to estimate Hp(3) for dosemeters irradiated to various beta and photon radiations including mixtures. The Q values (estimated/delivered dose equivalent) were found to be within ±20% for most of the photon beams.
Collapse
Affiliation(s)
- B Madhumita
- Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India
| | - C Sneha
- Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India
| | - V Dipali
- Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India
| | - S M Pradhan
- Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India
| | - A K Bakshi
- Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India
| | - S M Tripathi
- Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S K Singh
- Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| |
Collapse
|
35
|
Selvam TP, Chattaraj A, Datta D. FLUKA-BASED MONTE CARLO INVESTIGATION OF MICRODOSIMETRIC DISTRIBUTIONS OF TELECOBALT BEAM. Radiat Prot Dosimetry 2018; 178:430-440. [PMID: 29036422 DOI: 10.1093/rpd/ncx182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 08/29/2017] [Indexed: 06/07/2023]
Abstract
FLUKA-based Monte Carlo calculations of microdosimetric distributions in water phantom involving a walled spherical Tissue-Equivalent Proportional Counter filled with tissue-equivalent propane gas have been studied for an indigenously developed telecobalt machine. The simulated site size considered in the study was 2 μm. In the Monte Carlo calculations, field size was varied from 10 cm × 10 cm to 35 cm × 35 cm and the depth was varied as 5-20 cm. The study also includes calculation of microdosimetric distributions with a 30° wedge filter. The efficiency of the calculations was improved up to a factor of 26 by choosing appropriate cut off values for production and transport of electrons. The calculated microdosimetric distributions of telecobalt machine is distinctly different from that of a bare 60Co source which is attributed to the influence of scattered photons from the machine head and the water phantom.
Collapse
Affiliation(s)
- T Palani Selvam
- Radiological Physics & Advisory Division, Health, Safety & Environment Group, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - Arghya Chattaraj
- Radiological Physics & Advisory Division, Health, Safety & Environment Group, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - D Datta
- Radiological Physics & Advisory Division, Health, Safety & Environment Group, Bhabha Atomic Research Centre, Mumbai 400094, India
| |
Collapse
|
36
|
Rakesh RB, Kumar M, Sneha C, Ratna P, Datta D. BETA DOSE EVALUATION ALGORITHM FOR CaSO4:Dy BASED TLD BADGE USED IN COUNTRYWIDE PERSONNEL MONITORING PROGRAMME IN INDIA. Radiat Prot Dosimetry 2018; 178:342. [PMID: 28981805 DOI: 10.1093/rpd/ncx118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- R B Rakesh
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - Munish Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - C Sneha
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - P Ratna
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| |
Collapse
|
37
|
Kumar M, Datta D. Comments on "Radiological Risk Assessment of Cosmic Radiation at Aviation Altitudes (A Trip from Houston Intercontinental Airport to Lagos International Airport)". J Med Phys 2018; 42:279-280. [PMID: 29296044 PMCID: PMC5744458 DOI: 10.4103/jmp.jmp_55_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Munish Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| |
Collapse
|
38
|
Sahai MK, Pradhan SM, Bakshi AK, Datta D. Study of Residual TL of CaSO4:Dy-based Thermoluminescence Dosemeter. Radiat Prot Dosimetry 2017; 177:342-347. [PMID: 28453832 DOI: 10.1093/rpd/ncx052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 04/04/2017] [Indexed: 06/07/2023]
Abstract
Thermoluminescence (TL) signal obtained during second readout of a TL dosemeter disc previously exposed to ionising radiation is termed as residual TL. The origin of residual TL has not been discussed in detail so far in the literature. In this work, experimentally obtained residual TL signal and its origin is studied for CaSO4:Dy-based TL dosemeter through numerical simulation and role of deeper traps has been discussed.
Collapse
Affiliation(s)
- Manish K Sahai
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 094, India
| | - S M Pradhan
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 094, India
| | - A K Bakshi
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 094, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 094, India
| |
Collapse
|
39
|
Srivastava K, Soin S, Sapra BK, Ratna P, Datta D. FEASIBILITY STUDY FOR IDENTIFICATION OF STATIC AND DYNAMIC EXPOSURE USING CCD IMAGING TECHNIQUE FOR Caso4:Dy TL DOSEMETERS. Radiat Prot Dosimetry 2017; 176:309-315. [PMID: 28338940 DOI: 10.1093/rpd/ncx011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 01/25/2017] [Indexed: 06/06/2023]
Abstract
The occupational exposure incurred by the radiation workers due to the external radiation is estimated using personal dosemeter placed on the human body during the monitoring period. In certain situations, it is required to determine whether the dosemeter alone was exposed accidentally/intentionally in radiation field (static exposure) or was exposed while being worn by a worker moving in his workplace (dynamic exposure). The present thermoluminscent (TL) based personnel monitoring systems are not capable of distinguishing between the above stated (static and dynamic) exposure conditions. The feasibility of a new methodology developed using the charge coupled device based imaging technique for identification of the static/dynamic exposure of CaSO4:Dy based TL detectors for low energy photons has been investigated. The techniques for the qualitative and the quantitative assessments of the exposure conditions are presented in this paper.
Collapse
Affiliation(s)
- Kshama Srivastava
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai-40085, India
| | - Seepika Soin
- Industrial Plants Safety Division, Atomic Energy Regulatory Board, Mumbai-40094, India
| | - B K Sapra
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai-40085, India
| | - P Ratna
- Radiological Safety Division, Atomic Energy Regulatory Board, Mumbai-40094, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai-40085, India
| |
Collapse
|
40
|
Singh M, Mukhopadhyay D, Datta D. A numerical methodology for estimation of volatile fission products release from nuclear fuel. Nuclear Engineering and Design 2017. [DOI: 10.1016/j.nucengdes.2017.02.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
41
|
Kumar M, Bakshi AK, Rakesh RB, Ratna P, Kulkarni MS, Datta D. DEEP, SHALLOW AND EYE LENS DOSES FROM 106Ru/106Rh-A COMPARSION. Radiat Prot Dosimetry 2017; 176:211-216. [PMID: 28115659 DOI: 10.1093/rpd/ncw383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 12/20/2016] [Indexed: 06/06/2023]
Abstract
106Ru/106Rh is unique amongst other commonly used beta sources such as 147Pm, 85Kr, 204Tl, 32P, natU and 90Sr/90Y in the sense that it is capable of simultaneously delivering shallow/skin, eye lens and deep/whole body doses (WBDs) and they differ from each other substantially. In view of this, the investigation of various quantities defined for individual monitoring is possible and this makes 106Ru/106Rh beta source, a classical example in radiation protection and dosimetry. This led us to estimate skin, eye lens and WBDs for 106Ru/106Rh beta source. Optically stimulated luminescence based ultra-thin α-Al2O3:C disc dosimeters were used in the present study. Typical values (relative) of the eye lens and whole body/deep doses with respective to the skin dose (100%) were experimentally measured as ~66 ± 4.6% and 17 ± 3.9%, respectively. The study shows that 106Ru/106Rh beta source is capable of delivering even WBD which is not the case with other beta sources.
Collapse
Affiliation(s)
- Munish Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - A K Bakshi
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - R B Rakesh
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - P Ratna
- Operating Plant Safety Division, Atomic Energy Regulatory Board, Mumbai 400 094, India
| | - M S Kulkarni
- Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| |
Collapse
|
42
|
Ralph A, Ashfield-Watt P, Haralambos K, Datta D, McDowell I. A comparison of scoring criteria for the prediction of mutations for Familial Hypercholesterolaemia (FH) in a cohort of Welsh lipid index patients and family relatives. ATHEROSCLEROSIS SUPP 2017. [DOI: 10.1016/j.atherosclerosissup.2017.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
43
|
Haralambos K, Payne J, Datta D, McDowell I, Cramb R, Williams S, Cather M, Neely D, Soran H, Miedzybroadzka Z, Whitmore J, Williams M, Humphries S. How many patients with a monogenic diagnosis of Familial Hypercholesterolemia are currently known in UK lipid clinics? ATHEROSCLEROSIS SUPP 2017. [DOI: 10.1016/j.atherosclerosissup.2017.08.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
44
|
Chatterjee S, Banerjee K, Pandit D, Roy P, Bandyopadhyay T, Ravishankar R, Bhattacharya C, Bhattacharya S, Datta D, Banerjee SR. Optimization of beam dump shielding for K-130 cyclotron at VECC. Appl Radiat Isot 2017; 128:216-223. [PMID: 28738250 DOI: 10.1016/j.apradiso.2017.07.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 06/21/2017] [Accepted: 07/13/2017] [Indexed: 11/18/2022]
Abstract
A compact and efficient beam dump shield has been designed using Monte Carlo simulation code FLUKA to facilitate low background measurement of neutron and gamma rays using K130 cyclotron at Variable Energy Cyclotron Centre, Kolkata (VECC). Iron, lead and high density Polyethylene (HDPE) were considered in the design of the beam dump shield. Representative FLUKA simulation results have been validated using in-beam experiment performed on the same beam dump constituents. Experimental neutron and gamma-rays energy spectra have been found to be in fair agreement with the simulation results. Activation of various beam dump shield components were also carried out.
Collapse
Affiliation(s)
- S Chatterjee
- HS&E Group, Bhabha Atomic Research Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400085, India.
| | - K Banerjee
- Variable Energy Cyclotron Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400085, India
| | - Deepak Pandit
- Variable Energy Cyclotron Centre, Kolkata 700064, India
| | - Pratap Roy
- Variable Energy Cyclotron Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400085, India
| | - T Bandyopadhyay
- HS&E Group, Bhabha Atomic Research Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400085, India
| | - R Ravishankar
- HS&E Group, Bhabha Atomic Research Centre, Kolkata 700064, India
| | - C Bhattacharya
- Variable Energy Cyclotron Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400085, India
| | | | - D Datta
- HS&E Group, Bhabha Atomic Research Centre, Mumbai 400094, India; Homi Bhabha National Institute, Mumbai 400085, India
| | - S R Banerjee
- Variable Energy Cyclotron Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400085, India
| |
Collapse
|
45
|
Kumar R, Amols HI, Lovelock M, Sharma SD, Datta D. Quick, efficient and effective patient-specific intensity-modulated radiation therapy quality assurance using log file and electronic portal imaging device. J Cancer Res Ther 2017. [PMID: 28643751 DOI: 10.4103/jcrt.jcrt_1045_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIM The aim of work is to explore a quick, efficient, and effective patient-specific intensity-modulated radiation therapy (IMRT) quality assurance (QA). MATERIALS AND METHODS Software tools were developed to extract and analyze the multi-leaf collimator (MLC) leaf positions (LPs) from electronic portal imaging device (EPID) images for Varian C-series machine and TrueBeam, to extract useful data from MLC log file of C-series linear accelerator (LINAC), to extract useful information from the trajectory log binary file of TrueBeam LINAC, to compare LPs derived from EPID images with log file/trajectory log data, and to analyze IMRT treatment files using the MATLAB programming language. The difference in LP determined from the trajectory log and EPID images was proposed for patient-specific QA. RESULTS It was found that the differences in LP for regular radiation fields generated using stationary leaves are <0.5 mm for all the field sizes while for regular radiation fields generated using the moving leaves are more but <2 mm. The differences in LPs for IMRT field were also determined and found to be <2 mm. CONCLUSIONS The methodology demonstrated can be used for establishing the accuracy of trajectory log data and for independent routine IMRT QA by generating single number like gamma index to indicate pass or fail of an IMRT treatment plan. The QA indices such as numbers of occurrences of ≥2 mm error in LPS are found more than 5% of total number of occurrences; the dosimetric review of planned treatment is advisable.
Collapse
Affiliation(s)
- Rajesh Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CTCRS, Mumbai, Maharashtra, India
| | - H I Amols
- Department of Medical Physics, Ex-Memorial Sloan Kettering Cancer Centre, New York, USA
| | - M Lovelock
- Department of Medical Physics, Memorial Sloan Kettering Cancer Centre, New York, USA
| | - S D Sharma
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CTCRS, Mumbai, Maharashtra, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CTCRS, Mumbai, Maharashtra, India
| |
Collapse
|
46
|
Rakesh RB, Kumar M, Sneha C, Ratna P, Datta D. BETA DOSE EVALUATION ALGORITHM FOR CaSO4:Dy BYSED TLD BADGE USED IN COUNTRYWIDE PERSONNEL MONITORING PROGRAMME IN INDIA. Radiat Prot Dosimetry 2017; 175:96-103. [PMID: 27765890 DOI: 10.1093/rpd/ncw273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 08/31/2016] [Indexed: 06/06/2023]
Abstract
The prevalent algorithm for the estimation of beta dose, which in turn is used for estimation of skin dose for exposures involving beta radiations was observed to significantly overestimate the dose in individual monitoring based on CaSO4:Dy TLD badge in India. A new algorithm has been developed by estimating the correction factor from the response of dosemeter to different beta sources at various angles of incidence. The correction factor was observed to vary linearly with the ratio of the responses of dosemeter element without filter (D3) and dosemeter element under Perspex filter (D2). The correction factor determined using the ratio of D3 and D2 was applied to the response (D3) of dosemeter element without filter for estimation of beta dose. Protocol for identification of beta in the mixed gamma beta fields was defined such that it resulted in nearly same correction factor for given beta source in both gamma beta mixed fields and pure beta fields. The beta dose evaluation algorithm has provided the beta dose estimation within the required accuracy for >90% cases obtained from national quality assurance test data from different laboratories.
Collapse
Affiliation(s)
- R B Rakesh
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - Munish Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - C Sneha
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - P Ratna
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
| |
Collapse
|
47
|
Allen L, Datta D, Speight L, Ketchell R, Lau D, Duckers J. 289 Routinely testing serum magnesium in acute admissions to the All Wales Adult CF Centre (AWACFC) – are we doing the right thing? J Cyst Fibros 2017. [DOI: 10.1016/s1569-1993(17)30628-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
48
|
Akhilesh P, Kulkarni AR, Jamhale SH, Sharma SD, Kumar R, Datta D. Estimation of Eye Lens Dose During Brain Scans Using Gafchromic Xr-QA2 Film in Various Multidetector CT Scanners. Radiat Prot Dosimetry 2017; 174:236-241. [PMID: 27247444 DOI: 10.1093/rpd/ncw132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 05/06/2016] [Indexed: 06/05/2023]
Abstract
The purpose of this study was to estimate eye lens dose during brain scans in 16-, 64-, 128- and 256-slice multidetector computed tomography (CT) scanners in helical acquisition mode and to test the feasibility of using radiochromic film as eye lens dosemeter during CT scanning. Eye lens dose measurements were performed using Gafchromic XR-QA2 film on a polystyrene head phantom designed with outer dimensions equivalent to the head size of a reference Indian man. The response accuracy of XR-QA2 film was validated by using thermoluminescence dosemeters. The eye lens dose measured using XR-QA2 film on head phantom for plain brain scanning in helical mode ranged from 43.8 to 45.8 mGy. The XR-QA2 film measured dose values were in agreement with TLD measured dose values within a maximum variation of 8.9%. The good correlation between the two data sets confirms the viability of using XR-QA2 film for eye lens dosimetry.
Collapse
Affiliation(s)
- Philomina Akhilesh
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India
| | - Arti R Kulkarni
- Radiological Safety Division, Atomic Energy Regulatory Board, Niyamak Bhavan, Anushaktinagar, Mumbai 400094, India
| | - Shramika H Jamhale
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India
| | - S D Sharma
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India
| | - Rajesh Kumar
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India
| | - D Datta
- Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India
| |
Collapse
|
49
|
Srivastava K, Bakshi AK, Punekar MP, Kolambe DH, Ratna P, Datta D. Overview of the Quality Assurance Programme Implemented for TLD Based Individual Monitoring in India. Radiat Prot Dosimetry 2017; 174:175-184. [PMID: 27150519 DOI: 10.1093/rpd/ncw108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 04/05/2016] [Indexed: 06/05/2023]
Abstract
The effective implementation of a comprehensive quality assurance (QA) programme in any individual monitoring service plays a key role in attaining and sustaining the level of performance at par with international standards. In India, individual monitoring of more than 120 000 radiation workers is provided through 16 laboratories using a CaSO4:Dy based thermoluminescence dosimetry (TLD) badge system. In such a wide-spread programme, the harmonization of procedures and regular QA check on the dosimetry system are utmost important to ensure the uniform standard of accuracy and reliability of the service. This paper discusses some aspects of the QA programme implemented at different stages of the TLD monitoring system and provides the results of the performance test of monitoring laboratories.
Collapse
Affiliation(s)
- Kshama Srivastava
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - A K Bakshi
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - M P Punekar
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - D H Kolambe
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - P Ratna
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - D Datta
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
50
|
Beall D, Chambers M, Thomas S, Webb J, Goodman B, Talati S, Easton R, Datta D, Linville D. EVOLVE: A prospective and multicenter evaluation of outcomes for quality of life, pain and activities of daily living for balloon kyphoplasty in the treatment of Medicare-eligible subjects with vertebral compression fractures. J Vasc Interv Radiol 2017. [DOI: 10.1016/j.jvir.2016.12.641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|