Investigation on the accuracy of field widths and the quantitative relationship with energy variations for dynamic jaws helical tomotherapy.

Background And Purpose: TomoEDGE is an advanced technology for TomoTherapy treatment delivery by introducing a sliding-window dynamic jaw motion. The front and back jaws move independently at the start and end of a target volume along the longitudinal couch direction to reduce the undesired dose to the normal tissues. The accuracy of field width is essential to treatment delivery in this regard.

The impact of the ClearRT upgrade on target motion tracking accuracy in Radixact Synchrony lung treatments.

Background: The objective was to investigate the change in segmentation error of Radixact Synchrony lung treatment after its kV imaging system was upgraded from Generation 1 to Generation 2 in the ClearRT™ installation.

Materials And Methods: Radixact Lung Synchrony plans were created for the Model 18023 Xsight Lung Tracking "XLT" Phantom combined with different lung target inserts with densities of 0.280, 0.

Performance evaluation of online motion synchronizing systems for patient-specific respiratory movements with helical tomotherapy.

The introduction of online motion synchronizing system on helical tomotherapy paves way for robust motion tracking. A recent upgrade launches modifications on both hardware and software of the kV tracking system. An evaluation on the kV subsystems, prior (Version1) and post upgrade (Version2), was performed to compare tracking accuracy by means of fiducial tracking error and resulted root-mean-square (RMS).

Dosimetric impact of phase shifts on Radixact Synchrony tracking system with patient-specific breathing patterns.

Purpose: The Synchrony tracking system of Radixact is capable of real-time tumor tracking by building a correlation model between external light-emitting diodes on the patient's chest and an internal marker. A phase shift between the chest wall and a lung tumor has been reported. Hence, this study focused on evaluating the accuracy of the tracking system, especially under a patient-specific breathing pattern with respiratory phase shifts.

Multiple Aneurysms AnaTomy CHallenge 2018 (MATCH)-phase II: rupture risk assessment.

Purpose: Assessing the rupture probability of intracranial aneurysms (IAs) remains challenging. Therefore, hemodynamic simulations are increasingly applied toward supporting physicians during treatment planning. However, due to several assumptions, the clinical acceptance of these methods remains limited.

Performance evaluation of the CyberKnife system in real-time target tracking during beam delivery using a moving phantom coupled with two-dimensional detector array.

The aim of the current study was to evaluate the tracking error of the Synchrony Respiratory Tracking system by conducting beam-by-beam analyses to determine the variation in the tracking beams measured during target motion. A moving phantom of in-house design coupled with a two-dimensional (2D) detector array was used to simulate respiratory motion in the superoinferior (SI) and anteroposterior (AP) direction. A styrofoam block with four implanted fiducial markers was placed on top of the detector to enable the fiducial-based respiratory tracking.

Multiple Aneurysms AnaTomy CHallenge 2018 (MATCH): Phase I: Segmentation.

Purpose: Advanced morphology analysis and image-based hemodynamic simulations are increasingly used to assess the rupture risk of intracranial aneurysms (IAs). However, the accuracy of those results strongly depends on the quality of the vessel wall segmentation.

Methods: To evaluate state-of-the-art segmentation approaches, the Multiple Aneurysms AnaTomy CHallenge (MATCH) was announced.

Development of a novel methodology for QA of respiratory-gated and VMAT beam delivery using Octavius 4D phantom.

The objective of this study was to develop and evaluate a series of quality assurance (QA) techniques based on Octavius 4D phantom for testing of respiratory-gated treatment delivery, integrity of dose rate vs gantry speed in volumetric-modulated arc therapy (VMAT) commissioning, and multileaf collimator (MLC) positioning accuracy of a linear accelerator. An Octavius 4D phantom capable of rotating with the gantry and recording the detector signal with a sampling rate of 10 Hz was isocentrally set up and an inclinometer was also installed to measure the gantry angle simultaneously. A simple arc test was created and delivered with gating function activated to measure the timing accuracy of the gating window.

Posterior repair quantification (PR-Q) using key anatomical indicators (KAI): preliminary report.

Introduction And Hypothesis: Posterior vaginal compartment repairs (PR) have traditionally involved a subjective approach. We aim to quantify such repairs using key anatomical indicators (KAI).

Methods: At 50 consecutive PRs: perineal gap (PG); posterior vaginal vault descent (PVVD); mid-vaginal laxity (MVL-vault undisplaced/displaced); and recto-vaginal fascial laxity (RVFL) were measured.

Improving the clinical prediction of detrusor overactivity by utilizing additional symptoms and signs to overactive bladder symptoms alone.

Introduction And Hypothesis: We attempted to improve the accuracy of the clinical diagnosis of detrusor overactivity (DO) by using other significant clinical parameters in addition to overactive bladder (OAB) symptoms alone.

Methods: One thousand one hundred and forty women attending for their initial urogynecological assessment, including urodynamics, due to symptoms of pelvic floor dysfunction, underwent a comprehensive clinical and urodynamic assessment. Multivariate logistic regression analysis of a wide range of clinical parameters was used in order to determine a model of factors most accurately predicting the urodynamic diagnosis of DO.

Severe adolescent female stress urinary incontinence (SAFSUI): case report and literature review.

Introduction: Severe adolescent female stress urinary incontinence (SAFSUI) can be defined as female adolescents between the ages of 12 and 17 years complaining of involuntary loss of urine multiple times each day during normal activities or sneezing or coughing rather than during sporting activities. An updated review of its likely prevalence, etiology, and management is required.

Materials And Methods: The case of a 15-year-old female adolescent presenting with a 7-year history of SUI resistant to antimuscarinic medications and 18 months of intensive physiotherapy prompted this review.

Placenta praevia after prior caesarean section: an exploratory case-control study.

Objective: To identify additional risk factors for placenta praevia in women with prior caesarean section.

Method: A retrospective case-control study of 53 cases and 157 controls was performed. Information was obtained from the National Women's database between 2004 and 2009.

Multifocal multicentric squamous cell carcinomas arising in vulvovaginal lichen planus.

Objective: To describe a case of squamous cell carcinoma (SCC) arising in vulvovaginal lichen planus (LP) and to highlight difficulties in occult cancer surveillance in the setting of severe vaginal stenosis.

Case: A 67-year-old woman with long-standing systemic and vulvovaginal LP presented with multifocal vulvar SCC. Four months after radical vulvectomy and bilateral groin node dissection for stage IB carcinomas, she presented with stage III vaginal SCC arising in an obliterated vagina.