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https://www.readbyqxmd.com/read/28922191/acr-spr-str-practice-parameter-for-the-performance-of-cardiac-positron-emission-tomography-computed-tomography-pet-ct-imaging
#1
Rathan M Subramaniam, Warren R Janowitz, Geoffrey B Johnson, Martin A Lodge, Marguerite T Parisi, Mark R Ferguson, Jeffrey C Hellinger, Gregory W Gladish, Narainder K Gupta
This clinical practice parameter has been developed collaboratively by the American College of Radiology (ACR), the Society for Pediatric Radiology (SPR), and the Society of Thoracic Radiology (STR). This document is intended to act as a guide for physicians performing and interpreting positron emission tomography-computed tomography (PET/CT) of cardiac diseases in adults and children. The primary value of cardiac PET/CT imaging include evaluation of perfusion, function, viability, inflammation, anatomy, and risk stratification for cardiac-related events such as myocardial infarction and death...
September 15, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28921843/potential-proton-and-photon-dose-degradation-in-advanced-head-and-neck-cancer-patients-by-intratherapy-changes
#2
Kristin Stützer, Annika Jakobi, Anna Bandurska-Luque, Steffen Barczyk, Carolin Arnsmeyer, Steffen Löck, Christian Richter
PURPOSE: Evaluation of dose degradation by anatomic changes for head-and-neck cancer (HNC) intensity-modulated proton therapy (IMPT) relative to intensity-modulated photon therapy (IMRT) and identification of potential indicators for IMPT treatment plan adaptation. METHODS: For 31 advanced HNC datasets, IMPT and IMRT plans were recalculated on a computed tomography scan (CT) taken after about 4 weeks of therapy. Dose parameter changes were determined for the organs at risk (OARs) spinal cord, brain stem, parotid glands, brachial plexus, and mandible, for the clinical target volume (CTV) and the healthy tissue outside planning target volume (PTV)...
September 18, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28920111/interpretation-of-cone-beam-computed-tomography-volumetric-data-how-to-report-findings
#3
Mel Mupparapu, Adriana G Creanga, Steven R Singer
Cone beam computed tomography (CBCT) was introduced to the dental profession at the beginning of the new millennium and has become an integral part of dental practice, especially within the surgical specialties. With advances in technology and the introduction of new-generation digital detectors, the concomitant increase in pixel resolution provided the ability to discern fine details of the anatomy. This article focuses on the methodology of CBCT interpretation and reporting. Details of reviewing the volume thoroughly are described with relevant citations...
2017: Quintessence International
https://www.readbyqxmd.com/read/28919282/impact-of-pancreaticoduodenal-arcade-dilation-on-postoperative-outcomes-after-pancreaticoduodenectomy
#4
Yusuke Nakayama, Motokazu Sugimoto, Tatsushi Kobayashi, Naoto Gotohda, Shinichiro Takahashi, Masahiko Kusumoto, Masaru Konishi
BACKGROUND: The aim of this study was to investigate the impact of pancreaticoduodenal arcade (PDA) dilation on postoperative outcomes after pancreaticoduodenectomy. METHODS: Consecutive patients submitted to pancreaticoduodenectomy between 2008 and 2016 underwent preoperative multi-detector computed tomography, the images of which were re-reviewed. The patients were categorized according to the grade of PDA dilation into 3 groups (remarkably-dilated, slightly-dilated, and non-dilated)...
September 14, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/28918564/mri-combined-with-pet-ct-of-different-tracers-to-improve-the-accuracy-of-glioma-diagnosis-a-systematic-review-and-meta-analysis
#5
REVIEW
Yihan Yang, Mike Z He, Tao Li, Xuejun Yang
Based on studies focusing on positron emission tomography (PET)-computed tomography (CT) combined with magnetic resonance imaging (MRI) in the diagnosis of glioma, we conducted a systematic review and meta-analysis evaluating the pros and cons and the accuracy of different examinations. PubMed and Cochrane Library were searched. The search was conducted until April 2017. Two reviewers independently conducted the literature search according to the criteria set initially. Based on the exclusion criteria, 15 articles are included in this study...
September 16, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28916139/online-adaptive-radiation-therapy
#6
REVIEW
Stephanie Lim-Reinders, Brian M Keller, Shahad Al-Ward, Arjun Sahgal, Anthony Kim
The current paradigm of radiation therapy has the treatment planned on a snapshot dataset of the patient's anatomy taken at the time of simulation. Throughout the course of treatment, this snapshot may vary from initial simulation. Although there is the ability to image patients within the treatment room with technologies such as cone beam computed tomography, the current state of the art is largely limited to rigid-body matching and not accounting for any geometric deformations in the patient's anatomy. A plan that was once attuned to the initial simulation can become suboptimal as the treatment progresses unless improved technologies are brought to bear...
April 24, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28914744/cardiac-computed-tomography-before-and-after-cardiac-surgery
#7
Fernanda Erthal, Joao R Inacio, Samir Hazra, Vincent Chan, Benjamin J W Chow
Cardiac computed tomography angiography (CCTA) is a noninvasive imaging technique that has been rapidly adopted into clinical practice. Over the past decade, technological advances have improved CCTA accuracy, and there is an increasing amount of data supporting its prognostic value in the assessment of coronary artery disease. Recently, "appropriate use criteria" has been used as a tool to minimize inappropriate testing and reduce patient exposure to unnecessary risk and inconclusive studies. This review will summarize the appropriate uses of CCTA in patients before and after cardiac surgery...
September 13, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28913294/approach-to-frontal-sinus-outflow-tract-injury
#8
REVIEW
Yong Hyun Kim, Baek-Kyu Kim
Frontal sinus outflow tract (FSOT) injury may occur in cases of frontal sinus fractures and nasoethmoid orbital fractures. Since the FSOT is lined with mucosa that is responsible for the path from the frontal sinus to the nasal cavity, an untreated injury may lead to complications such as mucocele formation or chronic frontal sinusitis. Therefore, evaluation of FSOT is of clinical significance, with FSOT being diagnosed mostly by computed tomography or intraoperative dye. Several options are available to surgeons when treating FSOT injury, and they need to be familiar with these options to take the proper treatment measures in order to follow the treatment principle for FSOT, which is a safe sinus, and to reduce complications...
March 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28910382/refining-experimental-dental-implant-testing-in-the-g%C3%A3-ttingen-minipig-using-3d-computed-tomography-a-morphometric-study-of-the-mandibular-canal
#9
Giuliano M Corte, Johanna Plendl, Hana Hünigen, Kenneth C Richardson, Ole Gemeinhardt, Stefan M Niehues
This study reports morphometric and age-related data of the mandibular canal and the alveolar ridge of the Göttingen Minipig to avoid complications during in vivo testing of endosseus dental implants and to compare these data with the human anatomy. Using 3D computed tomography, six parameters of the mandibular canal as well as the alveolar bone height and the alveolar ridge width were measured in Göttingen Minipigs aged 12, 17 and 21 months. Our null hypothesis assumes that the age and the body mass have an influence on the parameters measured...
2017: PloS One
https://www.readbyqxmd.com/read/28906308/is-contralateral-templating-reliable-for-establishing-rotational-alignment-during-intramedullary-stabilization-of-femoral-shaft-fractures-a-study-of-individual-bilateral-differences-in-femoral-version
#10
William P Croom, Daniel J Lorenzana, Richard L Auran, Matthew J Cavallero, Nathanael Heckmann, Jackson Lee, Eric A White
OBJECTIVES: To determine native individual bilateral differences in femoral version in a diverse population. METHODS: Computed tomography scans with complete imaging of uninjured bilateral femora were used to determine femoral version and individual bilateral differences in version. Age, sex, and ethnicity of each subject were also collected. Femoral version and individual bilateral differences in version were correlated with demographic variables using univariate and multivariate regression models...
September 11, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28902968/two-step-eus-guided-antegrade-treatment-of-a-difficult-bile-duct-stone-in-a-surgically-altered-anatomy-patient
#11
Yousuke Nakai, Hiroyuki Isayama, Kazuhiko Koike
EUS-guided antegrade (EUS-AG) treatment is a treatment option for bile duct stones (BDS) in surgically altered anatomy patients[1, 2] but can be technically demanding due to the limitation of stone extraction devices[3, 4]. Herein, we presented a case of a difficult BDS successfully removed by two-step EUS-AG treatment after enterobiliary fistula maturation.A 73 year-old male with a history of gastrectomy and Roux-en-Y reconstruction for gastric cancer presented with 12-mm BDS on CT scan (Figure1). This article is protected by copyright...
September 13, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28902864/comparative-skull-anatomy-of-terrestrial-and-crevice-dwelling-trachylepis-skinks-squamata-scincidae-with-a-survey-of-resources-in-scincid-cranial-osteology
#12
Daniel J Paluh, Aaron M Bauer
Skinks account for more than 25% of all lizard species; however, representatives of fewer than a quarter of all species have been characterized osteologically. All but a few of the available cranial descriptions concentrate solely on characters that can be seen externally on the intact skull. Mabuyid skinks of the genus Trachylepis are the dominant, fully limbed skinks in Sub-Saharan Africa, and nearly all species have the same generalized body plan. Although a few rock crevice-dwelling species possess slight body depression, extreme dorsoventral depression is observed only in Trachylepis laevis...
2017: PloS One
https://www.readbyqxmd.com/read/28901659/using-gamma-index-to-flag-changes-in-anatomy-during-image-guided-radiation-therapy-of-head-and-neck-cancer
#13
Bryan Schaly, Jeff Kempe, Varagur Venkatesan, Sylvia Mitchell, Jerry J Battista
During radiation therapy of head and neck cancer, the decision to consider replanning a treatment because of anatomical changes has significant resource implications. We developed an algorithm that compares cone-beam computed tomography (CBCT) image pairs and provides an automatic alert as to when remedial action may be required. Retrospective CBCT data from ten head and neck cancer patients that were replanned during their treatment was used to train the algorithm on when to recommend a repeat CT simulation (re-CT)...
September 13, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28901622/assessment-of-prior-image-induced-nonlocal-means-regularization-for-low-dose-ct-reconstruction-change-in-anatomy
#14
Hao Zhang, Jianhua Ma, Jing Wang, William Moore, Zhengrong Liang
PURPOSE: Repeated computed tomography (CT) scans are prescribed for some clinical applications such as lung nodule surveillance. Several studies have demonstrated that incorporating a high-quality prior image into the reconstruction of subsequent low-dose CT (LDCT) acquisitions can either improve image quality or reduce data fidelity requirements. Our proposed previous normal-dose image induced nonlocal means (ndiNLM) regularization method for LDCT is an example of such a method. However, one major concern with prior image based methods is that they might produce false information when the prior image and the current LDCT image show different structures (for example, if a lung nodule emerges, grows, shrinks, or disappears over time)...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28901615/model-based-dose-reconstruction-for-ct-dose-estimation
#15
Mingye Wu, Zhye Yin, Bruno De Man
PURPOSE: Our goal is to develop a model-based approach for CT dose estimation. We previously presented a CT dose estimation method that offered good accuracy in soft tissue regions but lower accuracy in bone regions. In this work, we propose an improved physic-based approach to achieve high accuracy for any materials and realistic clinical anatomies. METHODS: Like Monte Carlo techniques, we start from a model or image of the patient and we model all relevant x-ray interaction processes...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28901573/validation-of-a-novel-cartoseg%C3%A2-segmentation-module-software-for-contrast-enhanced-computed-tomography-guided-radiofrequency-ablation-in-patients-with-atrial-fibrillation
#16
EDITORIAL
Hasan Imanli, Shaun Bhatty, Jean Jeudy, Yousra Ghzally, Kiddy Ume, Rama Vunnam, Refael Itah, Mati Amit, John Duell, Vincent See, Stephen Shorofsky, Timm M Dickfeld
INTRODUCTION: Visualization of left atrial (LA) anatomy using image integration modules has been associated with decreased radiation exposure and improved procedural outcome when used for guidance of pulmonary vein isolation (PVI) in atrial fibrillation (AF) ablation. We evaluated the CARTOSEG™ CT Segmentation Module (Biosense Webster, Inc.) that offers a new CT-specific semi-automatic reconstruction of the atrial endocardium. METHODS: The CARTOSEG™ CT Segmentation Module software was assessed prospectively in 80 patients undergoing AF ablation...
September 13, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28898423/iterative-volume-of-interest-based-4d-cone-beam-ct
#17
Rachael Martin, Moiz Ahmad, Geoffrey Hugo, Tinsu Pan
PURPOSE: 4D cone-beam CT (CBCT) has potential applications in soft tissue alignment and tumor motion verification at the time of radiation treatment. However, prominent streak artifacts with conventional image reconstructions have limited its clinical use and alternative reconstructions are generally too computationally expensive for the time available. We propose an iterative volume of interest based (I4D VOI) reconstruction technique, where 4D reconstruction is only performed within a VOI, to limit streak artifacts with limited added computation time...
September 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28895301/early-leaflet-thrombosis-complicating-transcatheter-implantation-of-a-sapien-3-valve-in-a-native-right-ventricular-outflow-tract
#18
Mounir Riahi, Philipp Blanke, John Webb, Ronald G Carere
A 59-year-old female with Tetralogy of Fallot had a previous complete repair with RVOT patch enlargement. She developed subsequent severe symptomatic (NYHA III) pulmonary regurgitation with severe RV dilatation. She had a concomitant interstitial lung disease secondary to hypersensitivity pneumonitis that precluded her from cardiac surgery. After preprocedural assessment using computed tomography, echocardiography and invasive angiography we decided to implant a 29 mm Edwards Sapien 3 valve without pre-stenting...
September 12, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28894833/ethmoidectomy-combined-with-superior-meatus-enlargement-increases-olfactory-airflow
#19
Hironobu Nishijima, Kenji Kondo, Tsutomu Nomura, Tatsuya Yamasoba
OBJECTIVES: The relationship between a particular surgical technique in endoscopic sinus surgery (ESS) and airflow changes in the post-operative olfactory region has not been assessed. The present study aimed to compare olfactory airflow after ESS between conventional ethmoidectomy and ethmoidectomy with superior meatus enlargement, using virtual ESS and computational fluid dynamics (CFD) analysis. STUDY DESIGN: Prospective computational study. MATERIALS AND METHODS: Nasal computed tomography images of four adult subjects were used to generate models of the nasal airway...
August 2017: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28891896/examination-of-nasolacrimal-duct-morphometry-using-cone-beam-computed-tomography-in-patients-with-unilateral-cleft-lip-palate
#20
Oğuzhan Altun, Numan Dedeoğlu, Mehmet Avci
OBJECTIVE: The cleft lip/palate (CLP) deformity negatively affects the anatomy of the nasal cavity and maxilla. The effects of this deformity on the lacrimal system have been unidentified yet. This study aimed to evaluate the morphometric changes in the nasolacrimal duct using cone-beam computed tomography (CBCT) in patients with unilateral CLP. MATERIALS AND METHODS: Retrospective bilateral measurements of the narrowest transversal diameters and the lengths of the nasolacrimal ducts were made for the affected and unaffected sides of 28 patients with CLP and 28 control patients, using the CBCT images...
September 7, 2017: Journal of Craniofacial Surgery
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