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Anatomy neck

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https://www.readbyqxmd.com/read/28096831/predeployed-aortic-extension-cuff-kilt-in-evar-with-hostile-neck-anatomy-using-endurant-ii-system-preliminary-results
#1
Krzysztof Szaniewski, Magdalena Biernacka, Ryszard L Walas, Marian Zembala
INTRODUCTION: Various modifications of standard endovascular aortic aneurysm repair (EVAR) have been developed to solve the problem of difficult neck anatomy. AIM: The authors propose the implantation of a predeployed extension cuff (kilt) using on-shelf Endurant II elements. In a vast majority of cases, the proposed method provides a solution for the hostile neck problem using standard Endurant II elements available in all centers performing subrenal EVAR procedures...
December 2016: Kardiochirurgia i Torakochirurgia Polska, Polish Journal of Cardio-Thoracic Surgery
https://www.readbyqxmd.com/read/28096728/high-resolution-imaging-of-neural-anatomy-and-pathology-of-the-neck
#2
REVIEW
Jeong Hyun Lee, Kai-Lung Cheng, Young Jun Choi, Jung Hwan Baek
The neck has intricately connected neural structures, including cervical and brachial plexi, the sympathetic system, lower cranial nerves, and their branches. Except for brachial plexus, there has been little research regarding the normal imaging appearance or corresponding pathologies of neural structures in the neck. The development in imaging techniques with better spatial resolution and signal-to-noise ratio has made it possible to see many tiny nerves to predict complications related to image-guided procedures and to better assess treatment response, especially in the management of oncology patients...
January 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28093693/a-simple-post-mortem-room-angiography-method-for-the-investigation-of-traumatic-basal-subarachnoid-hemorrhage
#3
Christopher P Johnson, Mike Murphy, George A Johnson, Stephen M Wills, Jonathan E Medcalf
Identifying the site of vascular bleeding in fatal cases of traumatic basal subarachnoid hemorrhage (TBSAH) is important, but can be very difficult to achieve when there is extensive blood clot in the posterior cranial fossa. Post mortem angiography in these circumstances has been reported previously but with mixed results, and is rarely used in current practice within the United Kingdom. We have developed a simple and effective post mortem angiography method, using fluoroscopy and clear modern contrast medium, suitable for use in the autopsy room...
January 17, 2017: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/28076989/improvement-of-patient-eligibility-with-the-use-of-new-generation-endografts-for-the-treatment-of-abdominal-aortic-aneurysms-a-comparison-study-among-currently-used-endografts-and-literature-review
#4
Nikolaos Kontopodis, George Papadopoulos, Nikolaos Galanakis, Dimitrios Tsetis, Christos V Ioannou
AIM: Newer generation devices have attempted to accommodate a wider range of aortoiliac anatomies offering endovascular aneurysm repair (EVAR) to more patients with abdominal aortic aneurysms (AAAs). We aim to examine the anatomic suitability for the ultra-low profile Ovation endograft in our AAA patients and to compare them with other contemporary devices. RESEARCH DESIGN AND METHODS: 158 consecutive AAA patients treated with EVAR or open surgical repair (OSR) were tested for EVAR eligibility according to the most commonly used endografts' instructions for use...
January 11, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28075438/quantitative-anatomical-differences-in-the-shoulder
#5
Usman Ali Mohammed Syed, Daniel E Davis, Jia-Wei Ko, Brian K Lee, Daniel Huttman, Adam Seidl, Carl Deirmengian, Joseph A Abboud
This study explored the radiographic and anatomical differences in normal shoulders between men and women, as well as factors such as race, height, weight, and age. A total of 205 patients with documented normal anatomical radiographs comprised the study population. Five fellowship-trained orthopedic surgeon reviewers measured head diameter, humeral head size, head to tuberosity distance, greater tuberosity width, neck-shaft angle, surface-arc angle, glenoid neck length, and distance from the lateral acromion process to the greater tuberosity on anteroposterior radiographs with the shoulder in external rotation...
January 11, 2017: Orthopedics
https://www.readbyqxmd.com/read/28073666/standard-endovascular-aneurysm-repair-in-patients-with-wide-infrarenal-aneurysm-necks-is-associated-with-increased-risk-of-adverse-events
#6
Nelson F G Oliveira, Frederico M Bastos Gonçalves, Marie Josee Van Rijn, Quirina de Ruiter, Sanne Hoeks, Jean-Paul P M de Vries, Joost A van Herwaarden, Hence J M Verhagen
OBJECTIVE: Endovascular aneurysm repair (EVAR) has progressively expanded to treat more challenging anatomies. Although EVAR in patients with wide infrarenal necks has been reported with acceptable results, there is still controversy regarding the longer-term outcomes. Our aim is to determine the impact of infrarenal neck diameter on midterm outcome following EVAR with a single endograft with suprarenal fixation. METHODS: A retrospective case-control study was designed using data from a prospective multicenter database...
January 7, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28070690/reconstruction-of-defects-of-the-trachea
#7
Margot Den Hondt, Jan Jeroen Vranckx
The trachea has a complex anatomy to fulfill its tasks. Its unique fibro-cartilaginous structure maintains an open conduit during respiration, and provides vertical elasticity for deglutition, mobility of the neck and speech. Blood vessels pierce the intercartilaginous ligaments to perfuse the ciliated epithelium, which ensures effective mucociliary clearance. Removal of a tracheal segment affected by benign or malignant disease requires airtight restoration of the continuity of the tube. When direct approximation of both tracheal ends is no longer feasible, a reconstruction is needed...
February 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28063076/automatic-detection-of-vertebral-number-abnormalities-in-body-ct-images
#8
Shouhei Hanaoka, Yoshiyasu Nakano, Mitsutaka Nemoto, Yukihiro Nomura, Tomomi Takenaga, Soichiro Miki, Takeharu Yoshikawa, Naoto Hayashi, Yoshitaka Masutani, Akinobu Shimizu
PURPOSE: The anatomical anomaly of the number of vertebral bones is one of the major anomalies in the human body, which can cause confusion of the spinal level in, for example, surgery. The aim of this study is to develop an automatic detection system for this type of anomaly. METHODS: We utilized our previously reported anatomical landmark detection system for this anomaly detection problem. This system uses a landmark point distribution model (L-PDM) to find multiple landmark positions...
January 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28048917/su-f-j-201-validation-study-of-proton-radiography-against-ct-data-for-quantitative-imaging-of-anatomical-changes-in-head-and-neck-patients
#9
A Hammi, D Weber, A Lomax
PURPOSE: In clinical pencil-beam-scanned (PBS) proton therapy, the advantage of the characteristic sharp dose fall-off after the Bragg Peak (BP) becomes a disadvantage if the BP positions of a plan's constituent pencil beams are shifted, eg.due to anatomical changes. Thus, for fractionated PBS proton therapy, accurate knowledge of the water equivalent path length (WEPL) of the traversed anatomy is critical. In this work we investigate the feasibility of using 2D proton range maps (proton radiography, PR) with the active-scanning gantry at PSI...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048730/su-f-t-148-are-the-approximations-in-analytic-semi-empirical-dose-calculation-algorithms-for-intensity-modulated-proton-therapy-for-complex-heterogeneities-of-head-and-neck-clinically-significant
#10
P Yepes, U Titt, D Mirkovic, A Liu, S Frank, R Mohan
PURPOSE: Evaluate the differences in dose distributions between the proton analytic semi-empirical dose calculation algorithm used in the clinic and Monte Carlo calculations for a sample of 50 head-and-neck (H&N) patients and estimate the potential clinical significance of the differences. METHODS: A cohort of 50 H&N patients, treated at the University of Texas Cancer Center with Intensity Modulated Proton Therapy (IMPT), were selected for evaluation of clinical significance of approximations in computed dose distributions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048653/tu-h-campus-jep1-01-characterization-of-a-parameterized-image-similarity-cost-function-for-automated-patient-and-site-specific-dir-accuracy-optimizations
#11
J Neylon, Y Min, K Hasse, D Low, A Santhanam
PURPOSE: Clinical deformable image registration (DIR) accuracy is difficult to quantify, making validation and verification manual and time consuming. It has also been seen that DIR accuracy can be improved by patient and site specific optimization. We previously investigated a cost function to parameterize image similarity metrics (ISMs) and provide a quantifiable comparison of DIR performance. In this abstract, we characterize and optimize the cost function response (CFR) and correlation to target registration error (TRE) in a dense registration parameter space...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048185/su-f-j-31-dual-energy-imaging-in-the-treatment-of-head-and-neck-tumors-a-phantom-study
#12
J Roeske, R Patel, M Surucu
PURPOSE: Organ motion, due to swallowing, can significantly affect the PTV margins used in head and neck patients. Evaluation of swallowing motion 2016 AAPM Annual Meeting Program Medical Physics, Vol. 43, No. 6, June 2016 3412 3412 may be performed using x-ray fluoroscopy. However, regions such as the soft palette and epiglottis may be difficult to visualize due to the presence of bone (mandible, teeth). The goal of this phantom study is to determine if dual energy (DE) subtraction would improve the visualization in these regions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047989/tu-ab-bra-03-atlas-based-algorithms-with-local-registration-goodness-weighting-for-mri-driven-electron-density-mapping
#13
R Farjam, N Tyagi, H Veeraraghavan, A Apte, K Zakian, M Hunt, J Deasy
PURPOSE: To develop image-analysis algorithms to synthesize CT with accurate electron densities for MR-only radiotherapy of head & neck (H&N) and pelvis anatomies. METHODS: CT and 3T-MRI (Philips, mDixon sequence) scans were randomly selected from a pool of H&N (n=11) and pelvis (n=12) anatomies to form an atlas. All MRIs were pre-processed to eliminate scanner and patient-induced intensity inhomogeneities and standardize their intensity histograms. CT and MRI for each patient were then co-registered to construct CT-MRI atlases...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047372/su-f-t-128-dose-volume-constraints-for-particle-therapy-treatment-planning
#14
R Stewart, W Smith, K Hendrickson, J Meyer, N Cao, E Lee, O Gopan, G Sandison, U Parvathaneni, G Laramore
PURPOSE: Determine equivalent Organ at Risk (OAR) tolerance dose (TD) constraints for MV x-rays and particle therapy. METHODS: Equivalent TD estimates for MV x-rays are determined from an isoeffect, regression-analysis of published and in-house constraints for various fractionation schedules (n fractions). The analysis yields an estimate of (α/β) for an OAR. To determine equivalent particle therapy constraints, the MV x-ray TD(n) values are divided by the RBE for DSB induction (RBEDSB ) or cell survival (RBES )...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047238/su-f-t-454-dose-mass-histogram-sensitivity-to-anatomical-changes-during-radiotherapy-for-hnscc
#15
M De Ornelas-Couto, E Bossart, N Elsayyad, M Samuels, C Takita, I Mihaylov
PURPOSE: To determine the sensitivity of dose-mass-histogram (DMH) due to anatomical changes of head-and-neck squamous cell carcinoma (HNSCC) radiotherapy (RT). METHODS: Eight patients undergoing RT treatment for HNSCC were scanned during the third and sixth week of RT. These second (CT2) and third (CT3) CTs were co-registered to the planning CT (CT1). Contours were propagated via deformable registration from CT1 and doses were re-calculated. DMHs were extracted for each CT set...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047176/su-c-bra-05-delineating-high-dose-clinical-target-volumes-for-head-and-neck-tumors-using-machine-learning-algorithms
#16
C Cardenas, A Wong, A Mohamed, J Yang, L Court, A Rao, C Fuller, M Aristophanous
PURPOSE: To develop and test population-based machine learning algorithms for delineating high-dose clinical target volumes (CTVs) in H&N tumors. Automating and standardizing the contouring of CTVs can reduce both physician contouring time and inter-physician variability, which is one of the largest sources of uncertainty in H&N radiotherapy. METHODS: Twenty-five node-negative patients treated with definitive radiotherapy were selected (6 right base of tongue, 11 left and 9 right tonsil)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047159/th-cd-207a-10-using-the-gamma-index-to-flag-changes-in-anatomy-during-radiation-therapy-of-head-and-neck-cancer
#17
B Schaly, J Kempe, S Mitchell, V Venkatesan, J Battista
PURPOSE: This article presents a fast algorithm for comparing 3-D anatomy from Cone-Beam CT (CBCT) imaging using the gamma comparison index and to demonstrate how this can be used to flag patients for possible re-planning of treatment. METHODS: CBCT scans acquired on a Varian linear accelerator during treatment were used as input to the gamma comparator using thresholds of 5 mm distance to agreement and 30 Hounsfield Unit CT number difference. The fraction 1 CBCT study was initially used as the reference...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047092/su-f-t-417-dosimetric-evaluation-of-dose-to-medium-vs-dose-to-water-using-acuros-xb-for-lung-spine-and-head-and-neck-plans
#18
S Yu, D Rosenzweig, M Pacella
PURPOSE: This study evaluates the dosimetric differences between dose-to-medium (Dm) and conventional dose-to-water (Dw) reporting using Varian's Acuros XB (AXB) dose calculation algorithm with actual patient treatment plans. METHODS: Twelve patients were selected: four head-and-neck (HN) (2 Gy × 33-35 fractions), four lung SBRT (10-12 Gy × 5 fractions) and four spine SBRT (6-8 Gy × 5 fractions) cases. All treatment plans were optimized using the Varian Eclipse Progressive Resolution Optimizer (version 13...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046932/su-g-jep2-02-a-unifying-multi-atlas-approach-to-electron-density-mapping-using-multi-parametric-mri-for-radiation-treatment-planning
#19
S Ren, W Hara, Q Le, L Wang, L Xing, R Li
PURPOSE: MRI has a number of advantages over CT as a primary modality for radiation treatment planning (RTP). However, one key bottleneck problem still remains, which is the lack of electron density information in MRI. In the work, a reliable method to map electron density is developed by leveraging the differential contrast of multi-parametric MRI. METHODS: We propose a probabilistic Bayesian approach for electron density mapping based on T1 and T2-weighted MRI, using multiple patients as atlases...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046836/we-fg-202-08-assessment-of-treatment-response-via-longitudinal-diffusion-mri-on-a-mri-guided-system-initial-experience-of-quantitative-analysis
#20
X Qi, Y Yang, L Yang, D Low, K Sheng
PURPOSE: To report our initial experience of systematic monitoring treatment response using longitudinal diffusion MR images on a Co-60 MRI-guided radiotherapy system. METHODS: Four patients, including 2 head-and-necks, 1 sarcoma and 1 GBM treated on a 0.35 Tesla MRI-guided treatment system, were analyzed. For each patient, 3D TrueFISP MRIs were acquired during CT simulation and before each treatment for treatment planning and patient setup purposes respectively...
June 2016: Medical Physics
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