Improvement of matching fields using coplanar field border method in postmastectomy radiotherapy

2021 ◽  
pp. 1-8
Author(s):  
Anupong Kongsa ◽  
Imjai Chitapanarux ◽  
Anirut Watcharawipha ◽  
Lalita Huntrakul ◽  
Warit Thongsuk ◽  
...  
Keyword(s):  
Organs At Risk ◽  
Three Dimensional ◽  
Performance Score ◽  
Method Performance ◽  
Postmastectomy Radiotherapy ◽  
Comparable Level ◽  
Collimator Angle ◽  
Significant Interest ◽  
Tangential Field ◽  
Low Performance

Abstract Aim: To propose a new matching method for the supraclavicular (SC) and tangential fields on three-dimensional radiotherapy (3DRT) for postmastectomy radiotherapy (PMRT). Methods: A method of matching coplanar field borders (CFB) between the tangential and SC fields was created in 3DRT. The collimator angle of the medial tangential field was calculated to coplanar the SC field. The proposed method performance was ultimately benchmarked using the half beam block (HBB) and traditional three-field monoisocenter (TTM) methods by dosimetric comparison. The decision score was then employed to clarify the performance among these methods. Results: The results show that the TTM method exhibited not only low doses on the organs at risk (OAR) but also on the matching fields. The CFB and HBB produced comparable results, but the ipsilateral lung yielded lesser amounts than the HBB. The decision score indicated a low performance level when using the TTM method, whereas the CBF method exhibited a slightly higher performance score than the HBB. Findings: The CFB exhibited good performance in terms of the dose on OARs and at the matching fields. This method offers a comparable level of performance to the HBB. Thus, the CFB offers an alternative method of significant interest in PMRT.

scholarly journals Filtering Biomechanical Signals in Movement Analysis

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4580
Author(s):  
Francesco Crenna ◽  
Giovanni Battista Rossi ◽  
Marta Berardengo
Keyword(s):  
Measurement Uncertainty ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Movement Analysis ◽  
Analytical Signal ◽  
Human Movement ◽  
Reference Points ◽  
Biomechanical Analysis ◽  
Method Performance ◽  
Acceleration Signal

Biomechanical analysis of human movement is based on dynamic measurements of reference points on the subject’s body and orientation measurements of body segments. Collected data include positions’ measurement, in a three-dimensional space. Signal enhancement by proper filtering is often recommended. Velocity and acceleration signal must be obtained from position/angular measurement records, needing numerical processing effort. In this paper, we propose a comparative filtering method study procedure, based on measurement uncertainty related parameters’ set, based upon simulated and experimental signals. The final aim is to propose guidelines to optimize dynamic biomechanical measurement, considering the measurement uncertainty contribution due to the processing method. Performance of the considered methods are examined and compared with an analytical signal, considering both stationary and transient conditions. Finally, four experimental test cases are evaluated at best filtering conditions for measurement uncertainty contributions.

A self-developed indoor three-dimensional pedestrian localization platform based on MEMS sensors

Sensor Review ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 157-167 ◽  
Author(s):  
Shengbo Sang ◽  
Ruiyong Zhai ◽  
Wendong Zhang ◽  
Qirui Sun ◽  
Zhaoying Zhou
Keyword(s):  
Low Cost ◽  
Angular Rate ◽  
Three Dimensional ◽  
Dead Reckoning ◽  
Rate Data ◽  
Mems Sensors ◽  
Micro Electro Mechanical Systems ◽  
Content Type ◽  
Position Errors ◽  
Low Performance

Purpose – This study aims to design a new low-cost localization platform for estimating the location and orientation of a pedestrian in a building. The micro-electro-mechanical systems (MEMS) sensor error compensation and the algorithm were improved to realize the localization and altitude accuracy. Design/methodology/approach – The platform hardware was designed with common low-performance and inexpensive MEMS sensors, and with a barometric altimeter employed to augment altitude measurement. The inertial navigation system (INS) – extended Kalman filter (EKF) – zero-velocity updating (ZUPT) (INS-EKF-ZUPT [IEZ])-extended methods and pedestrian dead reckoning (PDR) (IEZ + PDR) algorithm were modified and improved with altitude determined by acceleration integration height and pressure altitude. The “AND” logic with acceleration and angular rate data were presented to update the stance phases. Findings – The new platform was tested in real three-dimensional (3D) in-building scenarios, achieved with position errors below 0.5 m for 50-m-long route in corridor and below 0.1 m on stairs. The algorithm is robust enough for both the walking motion and the fast dynamic motion. Originality/value – The paper presents a new self-developed, integrated platform. The IEZ-extended methods, the modified PDR (IEZ + PDR) algorithm and “AND” logic with acceleration and angular rate data can improve the high localization and altitude accuracy. It is a great support for the increasing 3D location demand in indoor cases for universal application with ordinary sensors.

The Role of A Conventional Simulator in Multileaf-Plan Simulation: A Proposal

2001 ◽  
Vol 87 (2) ◽  
pp. 91-94 ◽  
Author(s):  
Carlo Capirci ◽  
Polico Cesare ◽  
Giovanni Mandoliti ◽  
Giovanni Pavanato ◽  
Marcello Gava ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Organs At Risk ◽  
Three Dimensional ◽  
Planning System ◽  
Hard Copy ◽  
Treatment Planning System ◽  
Magnification Factor ◽  
Radiographic Images ◽  
Modern Computer

Modern computer networks provide satisfying levels of data recording and verification between the treatment planning system (TPS) and the accelerators, while the main weakness of the preparation chain remains the simulation. When a conventional simulator is employed, it may adversely affect the three-dimensional treatment planning system (3DPS) process because of the difficulty to document the leaf positions on the simulator location films and on the patient's skin. With a conventional simulator, hard copies of the DRRs of each field and CT scans at isocenter level are needed. In an attempt to transfer more information displayed from a BEV perspective from the 3DPS to simulator radiographs, this study aimed to reduce the quality loss by using a 2D conventional simulator in a 3DPS process. We realized an acetate photocopy of TPS data for each field, from a BEV perspective, containing: DRR, wire frames of the PTV, organs at risk and MLC aperture. The photocopies, with an appropriate magnification factor to obtain a correct projective value (ratio 1:1) at isocenter level, are carefully placed on the radiographic images on the same hard copy which allows us to better understand possible setup errors and obliges us to correct these. The method provides reliable documentation, facilitates treatment verification, and fulfils the criteria for MLC simulation. It is accurate, simple, and very inexpensive.

scholarly journals Body mass index, dose to organs at risk during vaginal brachytherapy, and the role of three-dimensional CT-based treatment planning

Brachytherapy ◽  
2014 ◽  
Vol 13 (4) ◽  
pp. 332-336 ◽  
Author(s):  
John M. Boyle ◽  
Oana Craciunescu ◽  
Beverley Steffey ◽  
Jing Cai ◽  
Junzo Chino
Keyword(s):  
Body Mass Index ◽  
At Risk ◽  
Treatment Planning ◽  
Body Mass ◽  
Organs At Risk ◽  
Three Dimensional

Who are You? Theorising from the Experience of Working through an Avatar

2005 ◽  
Vol 2 (4) ◽  
pp. 414-425 ◽  
Author(s):  
Chris Jones
Keyword(s):  
European Union ◽  
Interest Groups ◽  
Three Dimensional ◽  
Point Of View ◽  
Networked Learning ◽  
The European Union ◽  
Significant Interest ◽  
E Learning ◽  
Funded Project ◽  
Set Up

This article explores the experience of a researcher who was part of a pan-European team exploring one of the currently available avatar worlds used for educational purposes. The article reports research undertaken as part of the European Union (EU)-funded project EQUEL (e-quality in e-learning) from the point of view of a single researcher. The EQUEL project was organised into several Significant Interest Groups (SIGs) and the Agora SIG was set up to explore knowledge-sharing in 3D (three-dimensional) avatar-based systems, in particular Active Worlds Educational Universe (AWEDU – http://www.activeworlds.com ). AWEDU is a relatively common, stable and explored 3D system. Further details of the research reported here can be found in papers presented by Jensen and Fejfer Olsen et al at the networked learning conference 2004 ( http://www.networkedlearningconference.org.uk/past/nlc2004 ).

scholarly journals Heart atlas for retrospective cardiac dosimetry: a multi-institutional study on interobserver contouring variations and their dosimetric impact

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Marcus Stockinger ◽  
Heiko Karle ◽  
Hannes Rennau ◽  
Sabine Sebb ◽  
Ulrich Wolf ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Radiation Therapy ◽  
Aortic Valve ◽  
Pulmonary Valve ◽  
Organs At Risk ◽  
Epidemiologic Studies ◽  
Retrospective Dosimetry ◽  
Volume Coefficient ◽  
Field Radiation ◽  
Tangential Field

Abstract Purpose Cardiac effects after breast cancer radiation therapy potentially affect more patients as survival improves. The heart’s heterogeneous radiation exposure and composition of functional structures call for establishing individual relationships between structure dose and specific late effects. However, valid dosimetry requires reliable contouring which is challenging for small volumes based on older, lower-quality computed tomography imaging. We developed a heart atlas for robust heart contouring in retrospective epidemiologic studies. Methods and materials The atlas defined the complete heart and geometric surrogate volumes for six cardiac structures: aortic valve, pulmonary valve, all deeper structures combined, myocardium, left anterior myocardium, and right anterior myocardium. We collected treatment planning records from 16 patients from 4 hospitals including dose calculations for 3D conformal tangential field radiation therapy for left-sided breast cancer. Six observers each contoured all patients. We assessed spatial contouring agreement and corresponding dosimetric variability. Results Contouring agreement for the complete heart was high with a mean Jaccard similarity coefficient (JSC) of 89%, a volume coefficient of variation (CV) of 5.2%, and a mean dose CV of 4.2%. The left (right) anterior myocardium had acceptable agreement with 63% (58%) JSC, 9.8% (11.5%) volume CV, and 11.9% (8.0%) mean dose CV. Dosimetric agreement for the deep structures and aortic valve was good despite higher spatial variation. Low spatial agreement for the pulmonary valve translated to poor dosimetric agreement. Conclusions For the purpose of retrospective dosimetry based on older imaging, geometric surrogate volumes for cardiac organs at risk can yield better contouring agreement than anatomical definitions, but retain limitations for small structures like the pulmonary valve.

scholarly journals ANALISA FAKTOR PENYEBAB RENDAHNYA KINERJA PERAWAT PELAKSANA DI RUMAH SAKIT KOTA MEDAN

2021 ◽  
Vol 4 (1) ◽  
pp. 106-112
Author(s):  
Kristina L. Silalahi ◽  
Patimah Sari Siregar
Keyword(s):  
Performance Appraisal ◽  
Three Dimensional ◽  
Sampling Technique ◽  
Cross Sectional Study ◽  
City Hospital ◽  
Chi Square ◽  
Cross Sectional ◽  
Nursing Services ◽  
Chi Square Test ◽  
Low Performance

Hospital is a health service with excellent and competitive service demands by its users. The function of the hospital was developed by the guidance of science and technology at its time. Performance appraisal is the most reliable tool for managers to control human resources and productivity and can be used effectively to direct employee behavior to produce nursing services based on high quality and quantity. The purpose of this study was to analyze the factors causing the low performance of nurses in Medan city hospital. This type of research is a quantitative study with a cross-sectional study design. This research was conducted at the Royal Prima Medan Hospital in July. The sample in this study were all nurses who served in the inpatient room. The sampling technique in this study using saturated sampling techniques totaling 159 nurses. Data collection using a questionnaire with the chi-square test. The results showed that the three-dimensional factors of nurse performance had a relationship with the performance of nurses, namely individual factors p = 0.000, psychological factors p = 0.006, and organization p = 0.002. This research concludes that the majority of nurses in the hospital still have low performance. The researcher's suggestion for the hospital is that the hospital pays more attention to the performance of the nurses who work in the inpatient room.

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