PubMed Journals Articles About "Independent Review 4DCT Scans Used SABR Treatment Planning" RSS

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Showing "Independent review 4DCT scans used SABR treatment planning" PubMed Articles 1–25 of 47,000+

Independent review of 4DCT scans used for SABR treatment planning.

Four-dimensional computerized tomography (4DCT) is required for stereotactic ablative body radiotherapy (SABR) of mobile targets to account for tumor motion during treatment planning and delivery. In this study, we report on the impact of an image review quality assurance process performed prior to treatment planning by medical physicists for 4DCT scans used for SABR treatment. Reviews were performed of 211 4DCT scans (193 patients) over a 3-yr period (October 2014 to October 2017). Treatment sites included...

Accounting for respiratory motion in small serial structures during radiotherapy planning: proof of concept in virtual bronchoscopy-guided lung functional avoidance radiotherapy.

Respiratory motion management techniques in radiotherapy (RT) planning are primarily focused on maintaining tumor target coverage. An inadequately addressed need is accounting for motion in dosimetric estimations in smaller serial structures. Accurate dose estimations in such structures are more sensitive to motion because respiration can cause them to move completely in or out of a high dose-gradient field. In this work, we study three motion management strategies (m1-m3) to find an accurate method to esti...

Response evaluation after stereotactic ablative radiotherapy for localized non-small-cell lung cancer - an equipoise of available resource and accuracy.

There is growing evidence supporting the use of stereotactic ablative radiotherapy (SABR) on the treatment of localized stage non-small-cell Lung cancer (NSCLC). Distinctive imaging challenges are posed post-SABR treatment. Thus, it is imperative to provide guidance on assessing treatment response, especially for new adopters. This commentary is about filling a gap in response evaluation after SABR for localized NSCLC.

Prospective Peer Review in Radiotherapy Treatment Planning: Long-term Results from a Longitudinal Study.

To present the longitudinal results of a prospective peer review evaluation system (PES) prior to treatment planning.

dosimetric multicenter planning comparison studies for SBRT: methodology and future perspectives.

In this review a summary of the published literature pertaining to the stereotactic body radiation therapy (SBRT) multiplanning comparison, data sharing strategies, and implementation of benchmark planning cases to improve the skills and knowledge of the participating centers was investigated. A total of 30 full-text articles were included. The studies were subdivided in three categories: multiplanning studies on dosimetric variability, planning harmonization before clinical trials, and technical and method...

Estimating PTV margins in head and neck stereotactic ablative radiation therapy (SABR) through target site analysis of positioning and intrafractional accuracy.

Recurrent and/or previously irradiated head and neck cancers (HNC) are therapeutically challenging and may benefit from high-dose, highly accurate radiation techniques, such as stereotactic ablative radiation therapy (SABR). Here, we compare set-up and positioning accuracy across HNC subsites to further optimize the treatment process and PTV margin recommendations for HN-SABR.

Technical Report: Diagnostic Scan Based Planning (DSBP), a method to improve the speed and safety of radiation therapy for the treatment of critically-ill patients.

Treating critically-ill patients in radiation oncology departments poses multiple safety risks. This study describes a method to improve the speed of radiation treatment for ICU patients by eliminating the need for CT simulation or on-table treatment planning using a patient's previously acquired diagnostic CT scans.

Quality of Life Outcomes after Stereotactic Ablative Radiotherapy (SABR) vs. Standard of Care Treatments in the Oligometastatic Setting: A Secondary Analysis of the SABR-COMET Randomized Trial.

Randomized data assessing the longitudinal quality of life (QoL) impact of SABR in the oligometastatic setting are lacking.

N-Phase Local Expansion Ratio for Characterizing Out-of-Phase Lung Ventilation.

Out-of-phase ventilation occurs when local regions of the lung reach their maximum or minimum volumes at breathing phases other than the global end inhalation or exhalation phases. This paper presents the N-phase local expansion ratio (LERN) as a surrogate for lung ventilation. A common approach to estimate lung ventilation is to use image registration to align the end exhalation and inhalation 3DCT images and then analyze the resulting correspondence map. This 2-phase local expansion ratio (LER2) is limite...

MRI-based IMPT planning for prostate cancer.

Treatment planning for proton therapy requires the relative proton stopping power ratio (RSP) information of the patient for accurate dose calculations. RSP are conventionally obtained after mapping of the Hounsfield units (HU) from a calibrated patient computed tomography (CT). One or multiple CT are needed for a given treatment which represents additional, undesired dose to the patient. For prostate cancer, magnetic resonance imaging (MRI) scans are the gold standard for segmentation while offering dose-l...

Stereotactic ablative body radiotherapy (SABR) for bone only oligometastatic breast cancer: A prospective clinical trial.

Stereotactic ablative body radiotherapy (SABR) is an emerging noninvasive approach for the treatment of oligometastases. Limited prospective evidence is available in breast cancer.

Virtual 4DCT from 4DMRI for the management of respiratory motion in carbon ion therapy of abdominal tumors.

To evaluate a method for generating virtual 4DCT from 4DMRI data in carbon ion radiotherapy with pencil beam scanning for abdominal tumors.

A machine learning-based real-time tumor tracking system for fluoroscopic gating of lung radiotherapy.

To improve respiratory-gated radiotherapy accuracy, we developed a machine learning approach for markerless tumor tracking and evaluated it using lung cancer patient data. Digitally reconstructed radiography (DRR) datasets were generated using planning 4DCT data. Tumor positions were selected on respective DRR images to place the GTV center of gravity in the center of each DRR. DRR subimages around the tumor regions were cropped so that the subimage size was defined by tumor size. Training data were then cl...

Targeted needs assessment of treatment planning education for United States radiation oncology residents.

Prior surveys suggest almost one-third of chief residents report insufficient exposure to treatment planning. We evaluated the state of treatment planning education among United States residents.

Method for a motion model based automated four-dimensional dose calculation.

The Vero system can treat intra-fractionally moving tumors with gimbaled dynamic tumor tracking (DTT) by rotating the treatment beam so that it follows the motion of the tumor. However, the changes in the beam geometry and the constant breathing motion of the patient influence the dose applied to the patient. This study aims to perform a full 4D dose reconstruction for thirteen patients treated with DTT at the Vero system at the Universitätsklinikum Erlangen and investigates the temporal resolution require...

Magnetic Resonance-guided High-intensity Focused Ultrasound (MRgHIFU) Virtual Treatment Planning for Abdominal Neuroblastoma Utilizing Retrospective Diagnostic 3D CT Images.

Magnetic resonance-guided high-intensity focused ultrasound (MRgHIFU) is a novel treatment for neuroblastoma using ultrasound-induced thermal ablation with real-time MR thermometry. It is unclear which patients would be amenable to MRgHIFU given the retroperitoneal location of many neuroblastomas within the smaller pediatric abdomen. In addition, planning relies on MR scans, which are not routine in the standard pediatric neuroblastoma workup. This study sought to demonstrate that neuroblastomas are targeta...

Succession Planning in Nursing Academia: A Scoping Review.

Purpose The purpose of this scoping review was to examine the range of literature about succession planning in nursing education. Background Succession planning establishes leadership continuity and inherent knowledge within an institution and nursing education. Most of the literature on succession in nursing is focused in the healthcare setting with limited information of succession planning in nursing education discovered. Method Arksey and O'Malley's (2005) framework was used to guide this review. Result...

Single nucleotide polymorphisms in treatment of polycystic ovary syndrome: a systematic review.

As 15-20% of reproductive aged females are suffering from polycystic ovary syndrome (PCOS), a large number of pharmacological preparations are frequently available in the market for the treatment of PCOS; however, they seem to be ineffective and cause undesirable side effects. This has emphasized the need to optimize dosage regimens for individualized treatment. The objective of this systematic review is to review single nucleotide polymorphisms (SNPs) associated with drugs used for the treatment of PCOS to...

Pathologic response after modern radiotherapy for non-small cell lung cancer.

In non-small cell lung cancer (NSCLC), pathologic complete response (pCR) following radiotherapy treatment has been shown to be an independent prognostic factor for long-term survival, progression-free survival and locoregional control. PCR is considered a surrogate to therapeutic efficacy, years before survival data are available, and therefore can be used to guide treatment plans and additional therapeutic interventions post-surgical resection. Given the extensive fibrotic changes induced by radiotherapy ...

The Feasibility and Effectiveness of Web-Based Advance Care Planning Programs: Scoping Review.

Advance care planning (ACP) is a process with the overall aim to enhance care in concordance with patients' preferences. Key elements of ACP are to enable persons to define goals and preferences for future medical treatment and care, to discuss these with family and health care professionals, and to document and review these if appropriate. ACP is usually conducted through personal conversations between a health care professional, a patient, and-if appropriate-family members. Although Web-based ACP programs...


To evaluate Pegasus optical coherence tomography (OCT), a clinical decision support software for the identification of features of retinal disease from macula OCT scans, across heterogenous populations involving varying patient demographics, device manufacturers, acquisition sites, and operators.

Automated planning of whole breast irradiation using hybrid IMRT improves efficiency and quality.

To develop an automated workflow for whole breast irradiation treatment planning using hybrid intensity modulated radiation therapy (IMRT) approach and to demonstrate that this workflow can improve planning quality and efficiency when compared to manual planning.

A Deep Learning Method for Producing Ventilation Images from 4DCT: First Comparison with Technegas SPECT Ventilation.

The purpose of this study is to develop a deep learning (DL) method for producing four-dimensional computed tomography (4DCT) ventilation imaging and to evaluate the accuracy of the DL-based ventilation imaging against SPECT ventilation imaging (SPECT-VI). The performance of the DL-based method is assessed by comparing with density change- and Jacobian-based (HU and JAC) methods.

Silent volumetric multi-contrast 7 Tesla MRI of ocular tumors using Zero Echo Time imaging.

Magnetic Resonance Imaging (MRI) has become a valuable imaging modality in ophthalmology, especially for the diagnosis and treatment planning of patients with uveal melanoma, the most common primary intra-ocular tumor. We aim to develop and evaluate the value of silent Zero Echo Time (ZTE) MRI to image patients with ocular tumors at 7Tesla. Therefore, ZTE and different types of magnetization-prepared ZTE (FLAIR, SPIR, T2 and Saturation recovery), have been developed. After an initial validation with 7 healt...

Considerations and adaptions to the modulated arc total body irradiation technique: dosimetry description.

Total body irradiation (TBI) is a complex treatment technique, which has been slow to transition to a three-dimensional (3D) planning approach. There is limited literature available providing a detailed description on methods to plan TBI on a 3D planning system. 3D planning using the modulated arc TBI (MATBI) technique is a complex process involving a significant number of quality assurance processes and scripts, due to more than 40 treatment beams and two patient positions. This article will focus on the w...

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