PubMed Journals Articles About "Varian Medical Systems Signs Brachytherapy Applicator Distribution Agreement" RSS

19:26 EST 11th December 2018 | BioPortfolio

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Showing "Varian Medical Systems Signs Brachytherapy Applicator Distribution Agreement" PubMed Articles 1–25 of 25,000+

High-dose rate intracavitary brachytherapy pretreatment dwell position verification using a transparent applicator.

The major errors in HDR brachytherapy are related to treatment distance, almost all of which are caused by incorrect applicator information. The aim of this study is to propose a quick pretreatment verification method to evaluate channel length and dwell position with a transparent applicator, which, in addition, is suitable as an education tool to assist in the understanding of the applicator structure.

Direction Modulated Brachytherapy (DMBT) Tandem Applicator for Cervical Cancer Treatment: Choosing the Optimal Shielding Material.

To investigate the dose modulation capability of a novel MRI-compatible Direction Modulated Brachytherapy (DMBT) tandem applicator design with various high density shielding materials for brachytherapy treatment of cervical cancer. The shield materials that have been evaluated are tantalum (Ta), pure tungsten (W), gold (Au), rhenium (Re), osmium (Os), platinum (Pt), iridium (Ir), and W' tungsten-alloy (95%W, 3.5%Ni, 1.5%Cu).

Determining Optimal Eluter Design by Modeling Physical Dose Enhancement in Brachytherapy.

In-situ drug release concurrent with radiation therapy has been proposed to enhance the therapeutic ratio of permanent prostate brachytherapy. Both brachytherapy sources and brachytherapy spacers have been proposed as potential eluters to release compounds, such as nanoparticles or chemotherapeutic agents. The relative effectiveness of the approaches has not been compared yet. This work models the physical dose enhancement of implantable eluters in conjunction with brachytherapy to determine which delivery ...

Counseling and Knowledge of Danger Signs of Pregnancy Complications in Haiti, Malawi, and Senegal.

Objectives Providing counseling on danger signs of pregnancy complications as part of visits for antenatal care (ANC) can raise expecting women's awareness so that if danger signs occur they can seek assistance in time. The study examines the level of agreement in counseling on danger signs between observation of the provider during the ANC visit and the client's report in the exit interview, and the association of this agreement with the client's level of knowledge on danger signs. Methods The analysis use...

Technical Note: The Design, Construction, and Evaluation of a Liquid-Based Single Phantom Solution for TG128 Brachytherapy Ultrasound QA.

Since the publication of the AAPM TG128 report for the quality assurance of prostate brachytherapy ultrasound systems, no commercially available phantoms have been developed which satisfy all of the task group recommendations. Current solid phantoms require a separate user-implemented setup using a container with liquid medium to evaluate the alignment between the needle template and the electronic grid, a test of geometric accuracy with critical implications in dosimetric quality. Utilizing a 3D printer, w...

Research and Implementation of Vital Signs Monitoring System Based on Cloud Platform.

Through analyzing the existing problems in the current mode, the vital signs monitoring information system based on cloud platform is designed and developed. The system's aim is to assist nurse carry out vital signs nursing work effectively and accurately. The system collects, uploads and analyzes patient's vital signs data by PDA which connecting medical inspection equipments. Clinical application proved that the system can effectively improve the quality and efficiency of medical care and may reduce medic...

National survey of intracavitary brachytherapy for intact uterine cervical cancer in Japan.

To review the current status of, and labor expended for (in terms of time required), intracavitary brachytherapy (ICBT) in definitive radiotherapy/chemoradiotherapy for cervical cancer patients, two national surveys were performed. The first survey was conducted between July and August 2016 and consisted of a questionnaire of 12 items regarding ICBT procedures for cervical cancer, which was sent to 173 centers installed with high-dose-rate remote after-loading brachytherapy systems. Between November and Dec...

DVH-based Inverse Planning using Monte Carlo Dosimetry for LDR Prostate Brachytherapy.

Inverse planning is an integral part of modern low-dose-rate (LDR) brachytherapy. Current clinical planning systems do not exploit the total dose information and largely use the AAPM TG-43 dosimetry formalism to ensure clinically acceptable planning times. Thus, sub-optimal plans may be derived due to TG-43-related dose overestimation and non-conformity with dose distribution requirements. The purpose of this study was to propose an inverse planning approach that can improve planning quality by combining do...

Mental Nerve Blocks for Lip Brachytherapy: A Case Report.

High dose rate interstitial brachytherapy is a commonly performed procedure for carcinoma of the lower lip. Placement of the brachytherapy catheters can be painful and may require monitored anesthesia care or general anesthesia. We present the use of bilateral mental nerve blocks with minimal sedation to facilitate placement of brachytherapy catheters.

IMRT/VMAT dose distributions generated for and collimators and accelerators.

The aim of this study is to answer the question whether the calculated dose distributions for HD and Millennium collimators (Varian Medical Systems) are equivalent for large treatment volumes.

Agreement of post-LASIK corneal power and corneal thickness measurements by pentacam and GALILEI corneal tomography systems.

Post-LASIK corneal conditions cannot be accurately measured by traditional optometric approaches. Therefore, we aimed to analyze the agreement of two rotating Scheimpflug cameras in corneal assessment.

Dosimetric study of GZP6 Co high dose rate brachytherapy source.

The purpose of this study was to obtain dosimetric parameters of GZP6 Co brachytherapy source number 3. The Geant4 MC code has been used to obtain the dose rate distribution following the American Association of Physicists in Medicine (AAPM) TG-43U1 dosimetric formalism. In the simulation, the source was centered in a 50 cm radius water phantom. The cylindrical ring voxels were 0.1 mm thick for r ≤ 1 cm, 0.5 mm for 1 cm  5 cm. The kerma-dose approximation was performed for r > 0.75 cm to inc...

Principles and Practice of HDR Penile Brachytherapy: Planning and Delivery Techniques.

To allow for organ preservation, high dose rate brachytherapy may be used in the treatment of localized penile cancer. Penile cancer is a rare malignancy, accounting for less than one percent of cancers in men in the United States. The standard treatment for localized disease is partial amputation of the penis. However, patients with T1b or T2 disease, less than 4 cm in maximum dimension and confined to the glans penis may be treated with brachytherapy as an organ-sparing approach. Previous works have descr...

Enhancing noise-induced switching times in systems with distributed delays.

The paper addresses the problem of calculating the noise-induced switching rates in systems with delay-distributed kernels and Gaussian noise. A general variational formulation for the switching rate is derived for any distribution kernel, and the obtained equations of motion and boundary conditions represent the most probable, or optimal, path, which maximizes the probability of escape. Explicit analytical results for the switching rates for small mean time delays are obtained for the uniform and bi-modal ...

Why is brachytherapy still essential in 2017?

These recent years, brachytherapy has benefited from imaging modalities advances. A more systematic use of tomodensitometric, ultrasonographic and MRI images during brachytherapy procedures has allowed an improvement in target and organs at risk assessment as well as their relationship with the applicators. New concepts integrating tumor regression during treatment have been defined and have been clinically validated. New applicators have been developed and are commercially available. Optimization processes...

Quality of Life After High-dose Brachytherapy in Patients with Early Oral Carcinoma.

The prevalence of head and neck tumors has continually increased over the past decades, which is a serious medical and social problem. This study retrospectively assessed the quality of life of patients with early-stage oral cavity tumors after high-dose rate (HDR) brachytherapy.

Initial experience with intraoperative phosphorous-32 brachytherapy during resection of malignant spinal tumors.

Brachytherapy is a major adjuvant modality for neoplasms, but few have trialed its use for spinal tumors. This study examines perioperative and oncological outcomes of malignant spinal tumor patients who underwent resection with intraoperative phosphorous-32 (P32) brachytherapy.

Surgical ward nurses' responses to worry: An observational descriptive study.

Rapid response systems aim to improve early recognition and treatment of deteriorating general ward patients. Sole reliance on deviating vital signs to escalate care in rapid response systems disregards nurses' judgments about a patient's condition based on worry and other indicators of deterioration. To make worry explicit, the Dutch-Early-Nurse-Worry-Indicator-Score was developed, summarising non-quantifiable signs of deterioration in the nine indicators: breathing, circulation, temperature, mentation, ag...

A multicenter dosimetry study to evaluate the imaging dose from Elekta XVI and Varian OBI kV-CBCT systems to cardiovascular implantable electronic devices (CIEDs).

The increasing use of daily CBCT in radiotherapy has raised concerns about the additional dose delivered to the patient, and it can also become a concern issue for those patients with cardiovascular implantable electronic devices (CIEDs) (Pacemaker [PM] and Implantable Cardioverter Defibrillator [ICD]). Although guidelines highly recommend that the cumulative dose received by CIEDs should be kept as low as possible, and a safe threshold based on patient risk classification needs to be respected, this additi...

Three-Dimensional Printed Plate-Guided I Brachytherapy for Malignant Parotid Tumors.

The treatment of malignant parotid tumors with I brachytherapy is rarely reported. This study evaluated the efficacy and dose and response of I brachytherapy in patients with malignant tumors.

Individualized 3D-printed templates for high-dose-rate interstitial multicathether brachytherapy in patients with breast cancer.

High-dose-rate, multicatheter interstitial brachytherapy is technically complex and operator-dependent, requiring lengthy training and specialized skills. Furthermore, until the advent of contouring on computerized tomography (CT) images, difficulties existed in locating the target volume precisely. The present article reports the results of a study that aimed at producing and validating a 3D-printed template to aid in target volume localization for multicatheter interstitial brachytherapy in patients with ...

A Novel Approach to Describing Traditional Chinese Medical Patterns: The "Traditional Chinese Medical Diagnostic Descriptor".

In the first of a series of three articles by the present authors, diagnostic agreement between Traditional Chinese Medicine (TCM) practitioners was found to be low. This was the first time that TCM diagnoses had been evaluated with an open population of patients and this result is a cause of concern. In the second article, incorrect statistics were shown to have often been used to calculate chance-removed inter-rater agreement, and appropriate statistics such as Gwet's Agreement Coefficient 2 (AC2) was rec...

Verification of the TrueBeam Head Shielding Model in Varian VirtuaLinac via Out-of-field Doses.

A good Monte Carlo model with an accurate head shielding model is important in estimating the long term risks of unwanted radiation exposure during radiation therapy. The aim of this paper is to validate the Monte Carlo simulation of a TrueBeam linear accelerator (linac) head shielding model. We approach this by evaluating the accuracy of out-of-field dose predictions at extended distances which are comprised of scatter from within the patient and treatment head leakage and thus reflect the accuracy of the ...

Evaluation of the "Quadrella" at 3 years: New index to assess functional and oncological performance specific to prostate brachytherapy.

"Quadrella" index has been recently developed to assess oncological and functional outcomes after prostate brachytherapy (PB). We aimed to evaluate this index at 1, 2, and 3 years, using validated questionnaires, assessed prospectively.

Five fraction accelerated partial breast irradiation using noninvasive image-guided breast brachytherapy: Feasibility and acute toxicity.

To improve efficiency, convenience, and cost, a prospective phase II trial was initiated to evaluate accelerated partial breast irradiation delivered with noninvasive image-guided breast brachytherapy (NIBB) via five once-daily fractions.

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