Assessment for the Utility of Treatment Plan QA System according to Dosimetric Leaf Gap in Multileaf Collimator

2015 ◽  
Vol 26 (3) ◽  
pp. 168
Author(s):  
Soon Sung Lee ◽  
Sang Hyoun Choi ◽  
Chul Kee Min ◽  
Woo Chul Kim ◽  
Young Hoon Ji ◽  
...  
Keyword(s):  
Treatment Plan ◽  
Multileaf Collimator ◽  
Dosimetric Leaf Gap

scholarly journals A simple method for determining dosimetric leaf gap with cross-field dose width for rounded leaf-end multileaf collimator systems

2018 ◽  
Vol 13 (1) ◽  
Author(s):  
Chih-Yuan Lin ◽  
An-Cheng Shiau ◽  
Jin-Huei Ji ◽  
Chia-Jung Lee ◽  
Ti-Hao Wang ◽  
...  
Keyword(s):  
Multileaf Collimator ◽  
Simple Method ◽  
Dosimetric Leaf Gap

scholarly journals Dosimetric Characterization of the Dual Layer MLC System for an O-Ring Linear Accelerator

2019 ◽  
Vol 18 ◽  
pp. 153303381988364 ◽  
Author(s):  
Michele M. Kim ◽  
Douglas Bollinger ◽  
Chris Kennedy ◽  
Wei Zou ◽  
Ryan Scheuermann ◽  
...  
Keyword(s):  
Linear Accelerator ◽  
Multileaf Collimator ◽  
Electronic Portal Imaging Device ◽  
Imaging Device ◽  
Portal Imaging ◽  
Electronic Portal Imaging ◽  
Flattening Filter Free ◽  
Flattening Filter ◽  
Dosimetric Leaf Gap

The Halcyon is Varian’s latest linear accelerator that offers a single 6X flattening-filter-free beam with a jawless design that features a new dual layer multileaf collimator system with faster speed and reduced transmission. Dosimetric characteristics of the dual layer multileaf collimator system including transmission, dosimetric leaf gap, and tongue and groove effects were measured. Ionization chambers, diode arrays, and an electronic portal imaging device were used to measure various multileaf collimator characteristics. Transmission through both multileaf collimator banks was found to be 0.008%, while the distal and proximal banks alone had transmission values of 0.4%. The penumbra was slightly sharper for fields using only the distal multileaf collimator bank but found to be largely independent of leaf position with values between 2.7 to 3.0 mm at dmax for the combined multileaf collimator banks. The dosimetric leaf gap was measured for the proximal and distal multileaf collimator banks both individually and together and found to have values of −0.216 mm, −0.225 mm, and 0.964 mm, respectively. Measurements of dosimetric leaf gap at the leaf edge and midline were also performed. Tongue and groove effects were investigated with both the electronic portal imaging device and a 2-dimensional array of diodes.

Clinical Implications of High Definition Multileaf Collimator (HDMLC) Dosimetric Leaf Gap (DLG) Variations

2016 ◽  
Vol 27 (3) ◽  
pp. 111 ◽  
Author(s):  
Kyung Hwan Chang ◽  
Yunseo Ji ◽  
Jungwon Kwak ◽  
Sung Woo Kim ◽  
Chiyoung Jeong ◽  
...  
Keyword(s):  
Clinical Implications ◽  
Multileaf Collimator ◽  
High Definition ◽  
Dosimetric Leaf Gap

The use of videotapes in treatment plan presentation seminars

1987 ◽  
Vol 51 (12) ◽  
pp. 720-722
Author(s):  
BJ Powell ◽  
BH Rice ◽  
LA Leonard
Keyword(s):  
Treatment Plan

Update: Behavioral Management of Unilateral Vocal Fold Paralysis and Paresis

2019 ◽  
Vol 4 (3) ◽  
pp. 474-482
Author(s):  
Sarah L. Schneider
Keyword(s):  
Vocal Fold ◽  
Treatment Plan ◽  
Traumatic Injury ◽  
Voice Therapy ◽  
Valuable Insight ◽  
Behavioral Management ◽  
Use Patterns ◽  
Vocal Quality ◽  
And Function ◽  
Voice Use

PurposeVocal fold motion impairment (VFMI) can be the result of iatrogenic or traumatic injury or may be idiopathic in nature. It can result in glottic incompetence leading to changes in vocal quality and ease. Associated voice complaints may include breathiness, roughness, diplophonia, reduced vocal intensity, feeling out of breath with talking, and vocal fatigue with voice use. A comprehensive interprofessional voice evaluation includes auditory-perceptual voice evaluation, laryngeal examination including videostroboscopy, acoustic and aerodynamic voice measures. These components provide valuable insight into laryngeal structure and function and individual voice use patterns and, in conjunction with stimulability testing, help identify candidacy for voice therapy and choice of therapeutic techniques.ConclusionA comprehensive, interprofessional evaluation of patients with VFMI is necessary to assess the role of voice therapy and develop a treatment plan. Although there is no efficacy data to support specific voice therapy techniques for treating VFMI, considerations for various techniques are provided.

Case Exercise: Toxic Exposure-Related Illness: Causation, Diagnosis, and Permanent Impairment

2007 ◽  
Vol 12 (2) ◽  
pp. 4-8
Author(s):  
Frederick Fung
Keyword(s):  
Concentration Level ◽  
Treatment Plan ◽  
Toxic Exposure ◽  
Dose Response Relationship ◽  
Specialty Board ◽  
History Of ◽  
Subjective Complaints ◽  
Based Medicine ◽  
Illness Causation ◽  
Rule Out

Abstract A diagnosis of toxic-related injury/illness requires a consideration of the illness related to the toxic exposure, including diagnosis, causation, and permanent impairment; these are best performed by a physician who is certified by a specialty board certified by the American Board of Preventive Medicine. The patient must have a history of symptoms consistent with the exposure and disease at issue. In order to diagnose the presence of a specific disease, the examiner must find subjective complaints that are consistent with the objective findings, and both the subjective complaints and objective findings must be consistent with the disease that is postulated. Exposure to a specific potentially causative agent at a defined concentration level must be documented and must be sufficient to induce a particular pathology in order to establish a diagnosis. Differential diagnoses must be entertained in order to rule out other potential causes, including psychological etiology. Furthermore, the identified exposure at the defined concentration level must be capable of causing the diagnosis being postulated before the examiner can conclude that there has been a cause-and-effect relationship between the exposure and the disease (dose-response relationship). The evaluator's opinion should make biological and epidemiological sense. The treatment plan and prognosis should be consistent with evidence-based medicine, and the rating of impairment must be based on objective findings in involved systems.

Reduction of major amputations in the diabetic ischaemic foot: A strategy to "take control" with conservative care as well as revascularisation

VASA ◽  
2001 ◽  
Vol 30 (Supplement 58) ◽  
pp. 6-14 ◽  
Author(s):  
Edmonds ◽  
Foster
Keyword(s):  
Natural History ◽  
Treatment Plan ◽  
Staging System ◽  
Vascular Control ◽  
New Approach ◽  
Conservative Care ◽  
Arterial Bypass ◽  
Therapeutic Footwear ◽  
Frequent Problem

The diabetic ischaemic foot has become an increasingly frequent problem over the last decade. However, we report a new approach consisting of a basic classification, a simple staging system of the natural history and a treatment plan for each stage, within a multi-disciplinary framework. This approach of "taking control" consists of two parts: 1. long-term conservative care including debridement of ulcers (to obtain wound control), eradication of sepsis (micribiological control), and provision of therapeutic footwear (mechanical control), and 2. revascularisation by angioplasty and arterial bypass (vascular control). This approach has led to a 50% reduction in the rate of major amputations in patients attending with ischaemic ulceration and absent foot pulses from 1989 to 1999 (from 4.6% to 2.3% per year). Patients who underwent angioplasty increased from 6% to 13%. Arterial bypass similarly increased from 3% to 7% of cases. However, even with an increased rate of revascularisation, 80% of patients responded to conservative care alone. This,we conclude, is an essential part of the management of all patients with ischaemic feet.

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