scholarly journals Personal Dosimetry Using Monte-Carlo Simulations For Occupational Dose Monitoring In Interventional Radiology: The Results Of A Proof Of Concept In A Clinical Setting

2021 ◽  
Author(s):  
A Almén ◽  
M Andersson ◽  
U O’Connor ◽  
M Abdelrahman ◽  
A Camp ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Interventional Radiology ◽  
Motion Tracking ◽  
Tracking System ◽  
Radiation Doses ◽  
Clinical Environment ◽  
Dose Equivalent ◽  
X Ray ◽  
Dose Monitoring ◽  
Occupational Dose

Abstract Exposure levels to staff in interventional radiology (IR) may be significant and appropriate assessment of radiation doses is needed. Issues regarding measurements using physical dosemeters in the clinical environment still exist. The objective of this work was to explore the prerequisites for assessing staff radiation dose, based on simulations only. Personal dose equivalent, Hp(10), was assessed using simulations based on Monte Carlo methods. The position of the operator was defined using a 3D motion tracking system. X-ray system exposure parameters were extracted from the x-ray equipment. The methodology was investigated and the simulations compared to measurements during IR procedures. The results indicate that the differences between simulated and measured staff radiation doses, in terms of the personal dose equivalent quantity Hp(10), are in the order of 30–70 %. The results are promising but some issues remain to be solved, e.g. an automated tracking of movable parts such as the ceiling-mounted protection shield.

scholarly journals Multi-sensor three-dimensional Monte Carlo localization for long-term aerial robot navigation

2017 ◽  
Vol 14 (5) ◽  
pp. 172988141773275 ◽  
Author(s):  
Francisco J Perez-Grau ◽  
Fernando Caballero ◽  
Antidio Viguria ◽  
Anibal Ollero
Keyword(s):  
Monte Carlo ◽  
Motion Tracking ◽  
Robot Navigation ◽  
Tracking System ◽  
Three Dimensional ◽  
Measurement Unit ◽  
Indoor Environments ◽  
Localization Algorithm ◽  
Monte Carlo Localization ◽  
Motion Tracking System

This article presents an enhanced version of the Monte Carlo localization algorithm, commonly used for robot navigation in indoor environments, which is suitable for aerial robots moving in a three-dimentional environment and makes use of a combination of measurements from an Red,Green,Blue-Depth (RGB-D) sensor, distances to several radio-tags placed in the environment, and an inertial measurement unit. The approach is demonstrated with an unmanned aerial vehicle flying for 10 min indoors and validated with a very precise motion tracking system. The approach has been implemented using the robot operating system framework and works smoothly on a regular i7 computer, leaving plenty of computational capacity for other navigation tasks such as motion planning or control.

MONTE CARLO ESTIMATION OF RADIATION DOSES IN RED BONE MARROW AND BREAST IN COMMON PEDIATRIC X-RAY EXAMINATIONS

2008 ◽  
Vol 95 (3) ◽  
pp. 331-336 ◽  
Author(s):  
George I. Gialousis ◽  
Emmanuel N. Yakoumakis ◽  
Anastasios I. Dimitriadis ◽  
Zografia K. Papouli ◽  
Nikolaos E. Yakoumakis ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Monte Carlo ◽  
Radiation Doses ◽  
Red Bone Marrow ◽  
X Ray ◽  
Monte Carlo Estimation

scholarly journals General radiographic patient dose monitoring using conformity test data

2021 ◽  
Vol 7 (6) ◽  
pp. 219-224
Author(s):  
I Ketut Putra ◽  
Gusti Agung Ayu Ratnawati ◽  
Gusti Ngurah Sutapa
Keyword(s):  
Interventional Radiology ◽  
Radiation Dose ◽  
Test Data ◽  
Medical Practitioners ◽  
X Ray ◽  
Patient Protection ◽  
Dose Monitoring ◽  
Test Parameters ◽  
Medical Exposure ◽  
Entrance Surface Air Kerma

Currently, the Nuclear Energy Supervisory Agency (BAPETEN) is actively guiding users or license holders related to patient protection against radiation hazards or often referred to as radiation protection and safety on medical exposure. Protection against medical exposure became a big issue when the mandatory compliance test on X-ray equipment for diagnostic and interventional radiology was introduced. In addition, license holders through their medical practitioners are also required to use the level of medical exposure guidelines. While PERKA BAPETEN No. 9, 2011 concerning the Suitability Test of Diagnostic and Interventional Radiology X-Ray device, states that one of the test parameters that directly affect the patient's radiation dose and determine the feasibility of operating the X-Ray device to the patient is information on the dose or rate of radiation dose received by the patient. Monitoring doses with Entrance Surface Air Kerma (ESAK) or what is often referred to as ESD (entrance surface dose) using suitability conformity test data starting from 50,60,70,80,90 and 100 kVp with 20 mAs at SID 100 meters. The results of the research on the value of ESAK was 0.049 mGy, an ESAK value that still met the national I-DRL value from BAPETEN Regulation No. 1211/K/V/2021.

scholarly journals Using Monte Carlo methods for Hp(0.07) values assessment during the handling of 18F-FDG

2020 ◽  
Vol 59 (4) ◽  
pp. 643-650
Author(s):  
Łukasz Albiniak ◽  
Małgorzata Wrzesień
Keyword(s):  
Monte Carlo ◽  
Radiation Transport ◽  
Ring Finger ◽  
Middle Finger ◽  
Radiation Doses ◽  
Dose Equivalent ◽  
Dose Limit ◽  
Values Assessment ◽  
18F Fdg ◽  
Thermoluminescent Detectors

Abstract The dose limit for the skin of the hand is typically converted to a surface of 1 cm2, which means that one needs to measure point doses in different places on the hand. However, the commonly used method of measuring doses on the hand, i.e., using a dosimetric ring including one or several thermoluminescent detectors worn at the base of a finger, is not adequate for manual procedures such as labeling or radiopharmaceutical injection. Consequently, the purpose of this study was to create and conduct a series of computer simulations that, by recreating the actual working conditions, would provide information on the values of ionizing radiation doses received by the most exposed parts of the hands of employees of radiopharmaceutical production facilities, as well as those of nurses during the injection of radiopharmaceuticals. The simulations were carried out using Monte Carlo radiation transport calculations. The Hp(0.07) personal dose equivalent values obtained for the fingertips of the index and middle fingers of nursing staff and chemists were within the range limited by the minimum and maximum Hp(0.07) values obtained as a result of dosimetric measurements carried out in diagnostic and production centers. Only in the case of the nurse’s fingertip, the simulated value of Hp(0.07 slightly exceeded the measured maximum Hp(0.07) value. The comparison of measured and simulated dose values showed that the largest differences in Hp(0.07) values occurred at the thumb tip, and for ring finger and middle finger of some of the nurses investigated.

scholarly journals Fluoroscopically-guided interventions with radiation doses exceeding 5000 mGy reference point air kerma: a dosimetric analysis of 89,549 interventional radiology, neurointerventional radiology, vascular surgery, and neurosurgery encounters

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Jacob J. Bundy ◽  
Ian W. McCracken ◽  
David S. Shin ◽  
Eric J. Monroe ◽  
Guy E. Johnson ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Radiation Dose ◽  
Vascular Surgery ◽  
Reference Point ◽  
Medical Specialty ◽  
Radiation Doses ◽  
Radiation Physics ◽  
Dose Area Product ◽  
Air Kerma ◽  
Dose Monitoring

Abstract Purpose To quantify and categorize fluoroscopically-guided procedures with radiation doses exceeding 5000 mGy reference point air kerma (Ka,r). Ka,r > 5000 mGy has been defined as a “significant radiation dose” by the Society of Interventional Radiology. Identification and analysis of interventions with high radiation doses has the potential to reduce radiation-induced injuries. Materials and methods Radiation dose data from a dose monitoring system for 19 interventional suites and 89,549 consecutive patient encounters from January 1, 2013 to August 1, 2019 at a single academic institution were reviewed. All patient encounters with Ka,r > 5000 mGy were included. All other encounters were excluded (n = 89,289). Patient demographics, medical specialty, intervention type, fluoroscopy time (minutes), dose area product (mGy·cm2), and Ka,r (mGy) were evaluated. Results There were 260 (0.3%) fluoroscopically-guided procedures with Ka,r > 5000 mGy. Of the 260 procedures which exceeded 5000 mGy, neurosurgery performed 81 (30.5%) procedures, followed by interventional radiology (n = 75; 28.2%), neurointerventional radiology (n = 55; 20.7%), and vascular surgery (n = 49; 18.4%). The procedures associated with the highest Ka,r were venous stent reconstruction performed by interventional radiology, arteriovenous malformation embolization performed by neurointerventional radiology, spinal hardware fixation by neurosurgery, and arterial interventions performed by vascular surgery. Neurointerventional radiology had the highest mean Ka,r (7,799 mGy), followed by neurosurgery (7452 mGy), vascular surgery (6849 mGy), and interventional radiology (6109 mGy). The mean Ka,r for interventional radiology performed procedures exceeding 5000 mGy was significantly lower than that for neurointerventional radiology, neurosurgery, and vascular surgery. Conclusions Fluoroscopically-guided procedures with radiation dose exceeding 5000 mGy reference point air kerma are uncommon. The results of this study demonstrate that a large proportion of cases exceeding 5000 mGy were performed by non-radiologists, who likely do not receive the same training in radiation physics, radiation biology, and dose reduction techniques as radiologists.

scholarly journals Development of a real-time internal and external marker tracking system for particle therapy: a phantom study using patient tumor trajectory data

2017 ◽  
Vol 58 (5) ◽  
pp. 710-719 ◽  
Author(s):  
Junsang Cho ◽  
Wonjoong Cheon ◽  
Sanghee Ahn ◽  
Hyunuk Jung ◽  
Heesoon Sheen ◽  
...  
Keyword(s):  
Motion Tracking ◽  
Tracking System ◽  
Particle Therapy ◽  
Tumor Motion ◽  
Trajectory Data ◽  
Motion Management ◽  
X Ray ◽  
Marker Tracking ◽  
Hybrid Motion ◽  
Motion Tracking System

Abstract Target motion–induced uncertainty in particle therapy is more complicated than that in X-ray therapy, requiring more accurate motion management. Therefore, a hybrid motion-tracking system that can track internal tumor motion and as well as an external surrogate of tumor motion was developed. Recently, many correlation tests between internal and external markers in X-ray therapy have been developed; however, the accuracy of such internal/external marker tracking systems, especially in particle therapy, has not yet been sufficiently tested. In this article, the process of installing an in-house hybrid internal/external motion-tracking system is described and the accuracy level of tracking system was acquired. Our results demonstrated that the developed in-house external/internal combined tracking system has submillimeter accuracy, and can be clinically used as a particle therapy system as well as a simulation system for moving tumor treatment.

Sign in / Sign up

Export Citation Format

Share Document