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CT scan head imaging

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https://www.readbyqxmd.com/read/28444799/pixel-wise-estimation-of-noise-statistics-on-iterative-ct-reconstruction-from-a-single-scan
#1
Tonghe Wang, Lei Zhu
PURPOSE: As iterative CT reconstruction continues to advance, the spatial distribution of noise standard deviation (STD) and accurate noise power spectrum (NPS) on the reconstructed CT images become important for method evaluation as well as optimization of algorithm parameters. Using a single CT scan, we propose a practical method for pixel-wise calculation of noise statistics on an iteratively reconstructed CT image, which enables accurate calculation of noise STD for each pixel and NPS...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28444772/multi-atlas-approach-with-local-registration-goodness-weighting-for-mri-based-electron-density-mapping-of-head-and-neck-anatomy
#2
Reza Farjam, Neelam Tyagi, Harini Veeraraghavan, Aditya Apte, Kristen Zakian, Margie A Hunt, Joseph O Deasy
PURPOSE: The growing use of magnetic resonance imaging (MRI) as a substitute for computed tomography-based treatment planning requires the development of effective algorithms to generate electron density maps for treatment planning and patient setup verification. The purpose of this work was to develop a method to synthesize computerized tomography (CT) for MR-only radiotherapy of head and neck cancer patients. METHODS: The algorithm is based on registration of multiple patient datasets containing both MRI and CT images (a "multi-atlas" algorithm)...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28441632/emergency-computed-tomography-in-patients-with-first-seizure
#3
Kaisa Kotisaari, Pekka Virtanen, Nina Forss, Daniel Strbian, Filip Scheperjans
PURPOSE: To determine the frequency of emergent imaging findings on head computed tomography (CT) in an adult population of first seizure (FS) patients presenting to an emergency department (ED); and to search for associations between clinical features and emergent imaging findings among these patients. METHODS: For this retrospective registry-based study, adult FS patients presenting to Helsinki University Hospital ED in 2006 were identified based on ICD-10 diagnosis...
April 17, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28439843/effective-dose-estimation-for-oncological-and-neurological-pet-ct-procedures
#4
Josep M Martí-Climent, Elena Prieto, Verónica Morán, Lidia Sancho, Macarena Rodríguez-Fraile, Javier Arbizu, María J García-Velloso, José A Richter
BACKGROUND: The aim of this study was to retrospectively evaluate the patient effective dose (ED) for different PET/CT procedures performed with a variety of PET radiopharmaceutical compounds. PET/CT studies of 210 patients were reviewed including Torso (n = 123), Whole body (WB) (n = 36), Head and Neck Tumor (HNT) (n = 10), and Brain (n = 41) protocols with (18)FDG (n = 170), (11)C-CHOL (n = 10), (18)FDOPA (n = 10), (11)C-MET (n = 10), and (18)F-florbetapir (n = 10)...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28439613/the-role-of-delayed-head-ct-in-evaluation-of-elderly-blunt-head-trauma-victims-taking-antithrombotic-therapy
#5
D Scantling, C Fischer, R Gruner, A Teichman, B McCracken, J Eakins
INTRODUCTION: Increasing active longevity has created an increasing surge of elderly trauma patients. The majority of these patients suffer blunt trauma and many are taking antithrombotic agents. The literature is mixed regarding the utility of routine repeat head CT in patients taking antithrombotic medications with a GCS of 15 and initial negative head CT. We hypothesized that scheduled delayed CT head 12 h after admission (D-CTH) in elderly blunt trauma victims would not identify clinically significant new hemorrhages or change management...
April 24, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/28439307/fluoroscopic-imaging-overestimates-the-screw-tip-to-subchondral-bone-distance-in-a-cadaveric-model-of-slipped-capital-femoral-epiphysis
#6
M J Heffernan, B Snyder, H Zhou, X Li
PURPOSE: Intra-operative imaging plays a key role in screw placement for slipped capital femoral epiphysis (SCFE). Complications have been associated with inadequate screw position. The purpose of this study was to evaluate computed tomography (CT) (3D fluoroscopy) and standard fluoroscopy (C-arm) images as compared with direct anatomic measurement to determine final screw position in a cadaveric SCFE model. METHODS: Osteotomy with pinning was performed at the physeal scar in ten cadaveric hips...
2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28437010/technical-note-comparison-of-peripheral-patient-dose-from-mr-guided-60-co-therapy-and-6mv-linear-accelerator-igrt
#7
Pascal Hauri, Roger A Hälg, Uwe Schneider
PURPOSE: The use of X-ray imaging in radiation therapy can give a substantial dose to the patient. A Cobalt machine combined with an magnetic resonance imaging (MRI) was recently introduced to clinical work. One positive aspect of using non-ionizing imaging devices is the reduction of the patient exposure. The purpose of this study was to quantify the difference in out-of-field dose to the patient between the image guided radiation therapy (IGRT) treatment applied with a linear accelerator with cone beam CT (CBCT) equipment and a Cobalt machine combined with an MRI...
April 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28435761/dual-energy-ct-in-head-and-neck-imaging
#8
REVIEW
Elise D Roele, Veronique C M L Timmer, Lauretta A A Vaassen, Anna M J L van Kroonenburgh, A A Postma
PURPOSE OF REVIEW: To explain the technique of Dual-energy CT (DECT) and highlight its applications and advantages in head and neck radiology. RECENT FINDINGS: Using DECT, additional datasets can be created next to conventional images. In head and neck radiology, three material decomposition algorithms can be used for improved lesion detection and delineation of the tumor. Iodine concentration measurements can aid in differentiating malignant from nonmalignant lymph nodes and benign posttreatment changes from tumor recurrence...
2017: Current Radiology Reports
https://www.readbyqxmd.com/read/28430715/computed-tomography-of-the-head-and-neck-region-for-tumor-staging-comparison-of-dual-source-dual-energy-and-low-kilovolt-single-energy-acquisitions
#9
Matthias Stefan May, Joscha Bruegel, Michael Brand, Marco Wiesmueller, Bernhard Krauss, Thomas Allmendinger, Michael Uder, Wolfgang Wuest
PURPOSE: The aim of this study was to intra-individually compare the image quality obtained by dual-source, dual-energy (DSDE) computed tomography (CT) examinations and different virtual monoenergetic reconstructions to a low single-energy (SE) scan. MATERIALS AND METHODS: Third-generation DSDE-CT was performed in 49 patients with histologically proven malignant disease of the head and neck region. Weighted average images (WAIs) and virtual monoenergetic images (VMIs) for low (40 and 60 keV) and high (120 and 190 keV) energies were reconstructed...
April 20, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28429741/the-risk-of-translaminar-screw-fixation-to-the-transverse-foramen-of-the-lower-cervical-spine-a-computed-tomography-study
#10
Ganggang Kong, Wei Ji, Zucheng Huang, Junhao Liu, Jianting Chen, Qingan Zhu
Translaminar screw fixation (TSF) of the axis is considered as an efficient, safe and simple surgical procedure, however the study of the potential risk of TSF to the transverse foramen in lower cervical spine is lacked. Head-neck CT images of 60 patients were included in this study. Maximum screw length, laminar thickness, the screw angle and the laminar height were measured. The feasibility of 3.5-mm diameter screw fixation and the potential risk of transverse foramen injury was analyzed. The TSF was safe at C3 and C4, but risky to the transverse foraman at a rate of 8...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28410679/dual-energy-imaging-method-to-improve-the-image-quality-and-the-accuracy-of-dose-calculation-for-cone-beam-computed-tomography
#11
Kuo Men, Jianrong Dai, Xinyuan Chen, Minghui Li, Ke Zhang, Peng Huang
PURPOSE: To improve the image quality and accuracy of dose calculation for cone-beam computed tomography (CT) images through implementation of a dual-energy cone-beam computed tomography method (DE-CBCT), and evaluate the improvement quantitatively. METHODS: Two sets of CBCT projections were acquired using the X-ray volumetric imaging (XVI) system on a Synergy (Elekta, Stockholm, Sweden) system with 120kV (high) and 70kV (low) X-rays, respectively. Then, the electron density relative to water (relative electron density (RED)) of each voxel was calculated using a projection-based dual-energy decomposition method...
April 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28397274/does-incidental-mastoid-opacification-on-computerized-tomography-necessitate-referral-to-ent
#12
Sophie L Wilkinson, Raguwinder S Sahota, James D Constable, Frazer Harper, Owen Judd
OBJECTIVE: The prevalence of incidental temporal bone disease on magnetic resonance imaging has been widely reported in the medical literature. Despite this, there currently is little evidence regarding incidental otological disease on computerized tomography (CT). Thus, the study aimed to review the CT prevalence of asymptomatic adult ear disease and evaluate the appropriateness of ear, nose, and throat (ENT) referral following its discovery. STUDY DESIGN: Retrospective observational study of 468 CT scans...
April 11, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28391603/embedded-clinical-decision-support-in-electronic-health-record-decreases-use-of-high-cost-imaging-in-the-emergency-department-embed-study
#13
Kelly Bookman, David West, Adit Ginde, Jennifer Wiler, Robert McIntyre, Andrew Hammes, Nichole Carlson, David Steinbruner, Matthew Solley, Richard Zane
OBJECTIVE: Evaluate the impact of evidence-based clinical decision support tools integrated directly into provider workflow in the electronic health record on utilization of CT brain, c-spine and pulmonary embolism (PE). METHODS: Validated, well accepted scoring tools for head injury, c-spine injury and pulmonary embolism were embedded into the electronic health record in a manner minimally disruptive to provider workflow. This was a longitudinal, before/after study in 5 emergency departments in a healthcare system with a common electronic health record...
April 9, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/28390805/from-transmandibular-to-transoral-robotic-approach-for-parapharyngeal-space-tumors
#14
Francesco Chu, Marta Tagliabue, Gioacchino Giugliano, Luca Calabrese, Lorenzo Preda, Mohssen Ansarin
PURPOSE: Parapharyngeal space (PPS) tumors are rare, accounting for 0.5% of all head-and-neck masses. Surgery remains the standard treatment for most cases, including different approaches (cervical approach, parotidectomy, mandibulotomy, transoral/robotic). We report our experience in the management of PPS tumors, aiming to create a surgical algorithm on the base of tumor's radiological and clinical characteristics. MATERIALS AND METHODS: Critical retrospective analysis of patients with PPS neoplasms who underwent surgery at our Institute...
March 31, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28384972/comparison-of-cone-beam-computed-tomography-and-multi-slice-computed-tomography-image-quality-of-human-dried-mandible-using-10-anatomical-landmarks
#15
Samira Saati, Fatemeh Kaveh, Shiva Yarmohammadi
INTRODUCTION: Cone Beam Computed Tomography (CBCT) has gained a broad acceptance in dentomaxillofacial imaging. Computed Tomography (CT) is another imaging modality for diagnosis and preoperative assessments of the head and neck region. AIM: Considering the increased radiation exposure and high cost of CT, this study sought to subjectively assess the image quality of CBCT and Multi Slice CT (MSCT). MATERIALS AND METHODS: A dry human mandible was scanned by five CBCT systems (New Tom 3G, Scanora, CRANEX 3D, Promax and Galileos) and one MSCT system...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28369295/cranial-imaging-before-lumbar-puncture-in-adults-with-community-acquired-meningitis-clinical-utility-and-adherence-to-the-infectious-diseases-society-of-america-guidelines
#16
Lucrecia Salazar, Rodrigo Hasbun
Background: The Infectious Diseases Society of America (IDSA) guidelines delineate criteria for the use of computed tomography (CT) scan of the head before lumbar puncture (LP) in adults with community-acquired meningitis (CAM). There is limited data documenting adherence to these guidelines and assessing the clinical utility of brain imaging. Methods: A retrospective analysis from January, 2005 to January, 2010 in Houston, Texas. Results: Among 614 adults with CAM, 407 patients (66...
March 21, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28367540/task-based-regularization-design-for-detection-of-intracranial-hemorrhage-in-cone-beam-ct
#17
H Dang, J W Stayman, J Xu, A Sisniega, W Zbijewski, X Wang, D H Foos, N Aygun, V E Koliatsos, J H Siewerdsen
Prompt and reliable detection of acute intracranial hemorrhage (ICH) is critical to treatment of a number of neurological disorders. Cone-beam CT (CBCT) systems are potentially suitable for detecting ICH (contrast 40-80 HU, size down to 1 mm) at the point of care but face major challenges in image quality requirements. Statistical reconstruction demonstrates improved noise-resolution tradeoffs in CBCT head imaging, but its capability in improving image quality with respect to the task of ICH detection remains to be fully investigated...
July 2016: Conference Proceedings of International Conference on Image Formation in X-Ray Computed Tomography
https://www.readbyqxmd.com/read/28367391/igg4-related-disease-presenting-as-a-pancreatic-mass-and-bilateral-lacrimal-gland-swelling
#18
Uroosa Ibrahim, Amina Saqib, Nikhil Nalluri, Muhammad R Raza, Mark Goldstein
IgG4-related disease is characterized by multi-system inflammation and possible elevation in serum immunoglobulin-G4 level. Treatment regimens include glucocorticoids, disease-modifying anti-rheumatic agents and recently, rituximab infusions have been reported to be effective in treatment-refractory disease. We present a case of a 64-year-old male presenting with acute abdominal pain and scleral icterus. An abdominal ultrasound demonstrated extensive biliary ductal dilatation. A computed tomography (CT) scan and a magnetic resonance cholangiopancreatography (MRCP) revealed a 4...
February 24, 2017: Curēus
https://www.readbyqxmd.com/read/28357093/triple-phase-99m-tc-3p-rgd2-imaging-of-peripheral-primitive-neuroectodermal-tumor-in-the-hip-muscle-group-with-bone-metastasis
#19
Jingjing Fu, Jinhua Song, Youcai Zhao, Feng Wang, Guoqiang Shao
Peripheral primitive neuroectodermal tumors (pPNETs) are a group of aggressive neoplasms that are most commonly encountered in pediatric patients and may be located in the abdomen, pelvis, thoracopulmonary region and, rarely, in the head and neck region. pPNETs in adults are extremely rare. The present study reports a case of pPNET located in the hip muscles with bone metastasis. The patient was a 44-year-old woman who complained of progressive pain and swelling with a mass near the left hip. Computed tomography (CT) and enhanced CT revealed a soft tissue mass lesion in the hip muscle group measuring 4...
February 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28353567/are-normal-hips-being-labeled-as-femoroacetabular-impingement-due-to-ee-angle
#20
Tian You, Bei Yang, Xin-Tao Zhang, Xiao-Cheng Jiang, Shuang Wang, Wen-Tao Zhang
Gluteal muscle contracture (GMC) is a clinical syndrome characterized by gait abnormality and limb dysfunction, as well as secondary deformities of pelvis and femur. Femoroacetabular impingement (FAI) typically could be diagnosed on the basis of computed tomography (CT) such as the equatorial-edge angle (EE angle), but it did not work well in GMC patients. In this study, we retrospected all image data and found small EE angles in GMCs, which meant retroverted acetabulum; however, none of them showed no symptoms and signs of FAI...
March 2017: Medicine (Baltimore)
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