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CT scan head imaging

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https://www.readbyqxmd.com/read/28530261/a-rare-case-of-embryonal-rhabdomyosarcoma-of-the-parapharyngeal-space
#1
G Iannella, M De Vincentiis, A Corsi, A Greco, G Magliulo
A 24-year-old man was admitted to our Otolaryngology Department following a head and neck CT scan performed for cranial trauma that showed a bulky neoformation in the right parapharyngeal space. Magnetic resonance imaging confirmed the presence of an oval formation with sharp margins and colliquative areas of necrosis involving the right parapharyngeal space. The mass was completely excised by a latero-cervical approach. Based on histological features and immunohistochemical analysis, a diagnosis of embryonal rhabdomyosarcoma of the parapharyngeal space was made...
May 22, 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28530209/reproducible-3d-printed-head-tanks-for-electrical-impedance-tomography-with-realistic-shape-and-conductivity-distribution
#2
James Avery, Kirill Aristovich, Barney Low, David Holder
OBJECTIVE: Electrical impedance tomography (EIT) has many promising applications in brain injury monitoring. To evaluate both instrumentation and reconstruction algorithms, experiments are first performed in head tanks. Existing methods, whilst accurate, produce a discontinuous conductivity, and are often made by hand, making it hard for other researchers to replicate. APPROACH: We have developed a method for constructing head tanks directly in a 3D printer. Conductivity was controlled through perforations in the skull surface, which allow for saline to pass through...
May 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28526235/zero-echo-time-mri-only-treatment-planning-for-radiation-therapy-of-brain-tumors-after-resection
#3
C Boydev, B Demol, D Pasquier, H Saint-Jalmes, G Delpon, N Reynaert
Using magnetic resonance imaging (MRI) as the sole imaging modality for patient modeling in radiation therapy (RT) is a challenging task due to the need to derive electron density information from MRI and construct a so-called pseudo-computed tomography (pCT) image. We have previously published a new method to derive pCT images from head T1-weighted (T1-w) MR images using a single-atlas propagation scheme followed by a post hoc correction of the mapped CT numbers using local intensity information. The purpose of this study was to investigate the performance of our method with head zero echo time (ZTE) MR images...
May 16, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28524786/variation-in-management-of-in-hospital-newborn-falls-a-single-center-experience
#4
Doron J Kahn, Paul D Fisher, Dean A Hertzler
OBJECTIVE There are only 3 small case series in the literature that report on the management of in-hospital newborn falls (NFs), and recommendations are unclear. The authors performed a retrospective review to determine outcome and differences in management and to understand why management of NFs varies at their institution. METHODS All NFs occurring within the authors' institution over a 3.5-year period were reviewed. Post-fall management and outcomes of each incident were compared. RESULTS There were 24 NFs out of 40,349 deliveries (5...
May 19, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28523162/a-preliminary-exploration-of-the-intravoxel-incoherent-motion-applied-in-the-preoperative-evaluation-of-mediastinal-lymph-node-metastasis-of-lung-cancer
#5
Xin Ye, Shuo Chen, Yaru Tian, Bin You, Wenqian Zhang, Yan Zhao, Tao Jiang, Bin Hu, Hui Li
BACKGROUND: The aim of this study was to investigate the diagnostic value of the intravoxel incoherent motion (IVIM) for distinguishing non-metastatic from metastatic mediastinal lymph nodes in lung cancer. METHODS: IVIM-diffusion weighted imaging (DWI) exams were performed preoperatively on 66 patients with lung cancer from October 2015 to June 2016 in Beijing Chao-Yang Hospital, Capital Medical University. Fifty patients underwent enhanced chest computed tomography (CT) in our hospital, while the other 16 patients already had enhanced chest CT images when they were admitted...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28513864/the-influence-of-non-rigid-anatomy-and-patient-positioning-on-endoscopy-ct-image-registration-in-the-head-and-neck
#6
W Scott Ingram, Jinzhong Yang, Richard Wendt, Beth M Beadle, Arvind Rao, Xin A Wang, Laurence E Court
PURPOSE: To assess the influence of non-rigid anatomy and differences in patient positioning between CT acquisition and endoscopic examination on endoscopy-CT image registration in the head and neck. METHODS: Radiotherapy planning CTs and 31-35 daily treatment-room CTs were acquired for nineteen patients. Diagnostic CTs were acquired for thirteen of the patients. The surfaces of the airways were segmented on all scans and triangular meshes were created to render virtual endoscopic images with a calibrated pinhole model of an endoscope...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28513854/verification-of-dose-profiles-generated-by-the-convolution-algorithm-of-the-gamma-knife-%C3%A2-radiosurgery-planning-system
#7
Hyun-Tai Chung, Jeong-Hoon Park, Kook Jin Chun
PURPOSE: A convolution algorithm that takes into account electron-density inhomogeneity was recently introduced to calculate dose distributions for the Gamma Knife (GK) Perfexion(™) treatment planning program. The accuracies of the dose distributions computed using the convolution method were assessed using an anthropomorphic phantom and film dosimetry. METHODS: Absorbed-dose distributions inside a phantom (CIRS Radiosurgery Head Phantom, Model 605) were calculated using the convolution method of the GK treatment-planning software (Leksell Gamma Plan(®) version 10...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28512099/mitral-valve-vegetation-diagnosed-with-oesophageal-ultrasound-with-bronchoscope-eus-b
#8
Ajoe John Kattoor, Yogita M Rochlani, Kevin Kuriakose, Nikhil K Meena
Oesophageal ultrasound with bronchoscope (EUS-B) is designed to evaluate mediastinal structures. We describe a case of a 78-year-old woman who presented with altered mental status for 2 weeks. CT head revealed a subacute infarct in the right middle cerebral artery distribution. She was also found to have a lung mass on chest imaging. EUS-B-guided fine needle aspiration demonstrated the presence of adenocarcinoma in station 7 lymph node and in the mass. Immunohistochemistry confirmed it to be a lung primary as the Thyroid Transcription Factor-1 (TTF-1) was strongly positive...
May 15, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28511564/head-and-neck-effective-dose-and-quantitative-assessment-of-image-quality-a-study-to-compare-cone-beam-ct-and-multislice-spiral-ct
#9
Cosimo Nardi, Cinzia Talamonti, Stefania Pallotta, Paola Saletti, Linda Calistri, Cesare Cordopatri, Stefano Colagrande
OBJECTIVES: To evaluate the effective dose and image quality of horizontal Cone Beam CT (CBCT) in comparison with Multislice Spiral CT (MSCT) in head, cervical spine, ear and dental arches scans. METHODS: Head and neck Alderson-Rando phantom equipped with seventy-four thermoluminescence dosimeters was exposed according to five different scans in CBCT and four different scans in MSCT. Spatial and contrast resolution, in terms of Modulation Transfer Function (MTF) and Contrast-to-Noise Ratio (CNR), were measured to obtain a quantitative assessment of image quality...
May 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28508120/effects-of-arm-truncation-on-the-appearance-of-the-halo-artifact-in-68-ga-psma-11-hbed-cc-pet-mri
#10
Ali Afshar-Oromieh, Maya Wolf, Uwe Haberkorn, Marc Kachelrieß, Regula Gnirs, Klaus Kopka, Heinz-Peter Schlemmer, Martin T Freitag
PURPOSE: PSMA ligand imaging with hybrid PET/MRI scanners could be an integral part of the clinical routine in the future. However, the first study about this novel method revealed a severe photopenic artifact ("halo artifact") around the urinary bladder causing significantly reduced tumor visibility. The aim of this evaluation was to analyze the role of arm truncation on the appearance of the halo artifact in (68)Ga-PSMA-11 PET/MRI hypothesizing that this influences the appearance. METHODS: Twenty-seven consecutive patients were subjected to (68)Ga-PSMA-11 PET/CT (1 h p...
May 15, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28506020/rigid-motion-artifact-reduction-in-ct-using-frequency-domain-analysis
#11
Yuan Zhang, Liyi Zhang, Yunshan Sun
BACKGROUND: It is often unrealistic to assume that the subject remains stationary during a computed tomography (CT) imaging scan. A patient rigid motion can be decomposed into a translation and a rotation around an origin. How to minimize the motion impact on image quality is important. OBJECTIVE: To eliminate artifacts caused by patient rigid motion during a CT scan, this study investigated a new method based on frequency domain analysis to estimate and compensate motion impact...
May 6, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28502689/complicated-mild-traumatic-brain-injury-and-the-need-for-imaging-surveillance
#12
Martina Stippler, Jingyi Liu, Rouzbeh Motiei-Langroudi, Zoya Voronovich, Howard Yonas, Roger B Davis
OBJECTIVE: to evaluate the need for repeat head CT in patients with complicated mild traumatic brain injury (cmTBI) determined non-operative after the first head CT METHODS: 380 patients with mild TBI and a positive head CT not needing surgery were included. Changes between first and second head CT were categorized as decreased, increased or stable. RESULTS: Three patients required neurosurgical intervention (0.8%) after the second CT. There were no significant differences in demographics including age, gender, alcohol consumption, anticoagulation status, time between first and second CT, GCS at admission and discharge, and incidence of SAH, EDH, contusion or skull fractures between the operated and non-operated groups...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28497165/linear-relationship-between-lateralization-of-the-bicipital-groove-and-humeral-retroversion-and-its-link-with-the-biepicondylar-humeral-line-anatomical-study-of-seventy-cadaveric-humerus-scans
#13
Julien Andrin, Pierre Pottecher, Brice Viard, Emmanuel Baulot, Pierre Trouilloud, Pierre Martz
INTRODUCTION: Morphological studies of the humerus have shown that the position of the bicipital groove varies with the individual and the retroversion of the humeral head. Depending on the authors, these two parameters are independent or associated. This study evaluated the relationship between the humeral head axis and its retroversion and the bicipital groove relative to the humeral biepicondylar line. MATERIALS AND METHODS: Seventy cadaveric humeri were scanned to obtain 3D reconstructions...
May 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28497009/false-positive-positron-emission-tomography-computed-tomography-scans-in-treated-head-and-neck-cancers
#14
Michael K Cheung, Shawn Y Ong, Uma Goyal, Betsy C Wertheim, Charles C Hsu, Sun K Yi
OBJECTIVE: Positron emission tomography/computed tomography (PET/CT) imaging for head and neck cancers (HNC) is commonly utilized for post-treatment assessment. Though PET/CT in this setting has been reported to have high negative predictive values (> 90%), positive predictive values have been reported at approximately 50%, leading to high rates of false positivity (FP) and troubling management decisions for both patient and practitioner. The objective of this study was to identify patient, disease, treatment and imaging factors that might be associated with a higher likelihood of FP on initial post-treatment PET/CT imaging for patients treated for HNC...
April 10, 2017: Curēus
https://www.readbyqxmd.com/read/28479521/the-retrolabyrinthine-presigmoid-approach-to-the-anterior-cerebellopontine-region-expanding-the-limits-of-trautmann-s-triangle
#15
Fernando Alonso, Simone E Dekker, James Wright, Christina Wright, Andrea Alonso, Margaret Carmody, R Shane Tubbs, Nicholas C Bambakidis
The anatomical area exposed through the exposure of Trautmann's triangle may not be sufficient. We studied the additional exposure provided by skeletonizing the sigmoid sinus. Human cadaver heads were subjected to a thin temporal bone CT scan for a total of 10 sides. The estimated surgical working angle was calculated based on the relationship of the sigmoid sinus to the posterior semicircular canal, superior petrosal sinus and jugular bulb on imaging. The heads were then subjected to a mastoidectomy and remeasured with and without sigmoid sinus skeletonization...
May 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28473594/evaluation-of-sinus-edge-corrected-zte-based-attenuation-correction-in-brain-pet-mri
#16
Jaewon Yang, Florian Wiesinger, Sandeep Kaushik, Dattesh Shanbhag, Thomas A Hope, Peder E Z Larson, Youngho Seo
Purpose: In brain positron emission tomography/magnetic resonance imaging (PET/MRI), the major challenge of zero-echo-time (ZTE)-based attenuation correction (ZTAC) is the misclassification of air/tissue/bone mixtures or their boundaries. Our study aimed to evaluate a sinus/edge corrected (SEC) ZTAC (ZTACSEC), relative to an "uncorrected (UC)" ZTAC (ZTACUC) and a computed tomography (CT) atlas-based attenuation correction (ATAC). Materials and Methods: Whole-body fluorodeoxyglucose PET/MRI scans were performed for twelve patients, following PET/CT scans...
May 4, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28471869/low-energy-virtual-monochromatic-dual-energy-computed-tomography-images-for-the-evaluation-of-head-and-neck-squamous-cell-carcinoma-a-study-of-tumor-visibility-compared-with-single-energy-computed-tomography-and-user-acceptance
#17
Reza Forghani, Hillary Kelly, Eugene Yu, Manon Belair, Laurent Létourneau-Guillon, Huy Le, Francesca Proulx, Thomas Ong, Xianming Tan, Hugh D Curtin, Mark Levental
OBJECTIVE: Dual-energy computed tomography (CT) 40-keV virtual monochromatic images (VMIs) have been reported to improve visualization of head and neck squamous cell carcinoma, but a direct comparison to single-energy CT (SECT) is lacking, and there is debate regarding subjective user preference. We compared 40-keV VMIs with SECT and performed a subjective evaluation of their utility and acceptability for clinical use. METHODS: A total of 60 dual-energy CT and 60 SECT scans from 2 different institutions were evaluated...
May 2, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28468949/identification-of-a-novel-the-itg%C3%AE-v%C3%AE-6-binding-peptide-using-protein-separation-and-phage-display
#18
Uwe Haberkorn, Annette Altmann, Max Sauter, Saskia Roesch, Walter Mier, Rolf Warta, Juergen Debus, Gerhard Dyckhoff, Christel Herold-Mende
PURPOSE: Targeted therapies are regarded as promising approaches to increase 5-year survival rate of head and neck squamous cell carcinoma (HNSCC) patients. EXPERIMENTAL DESIGN: For the selection of carcinoma-specific peptides membrane proteome of HNO97 tumor cells fractionated by the ProteomeLab™ PF2D system and corresponding HNO97 cells were deployed for an alternating biopanning using a sunflower trypsin inhibitor1-based phage display (SFTI8Ph) library. Stability, binding properties and affinity of novel candidates were assessed in vitro using radio-HPLC, binding experiments and surface plasmon resonance assay (SPR), respectively...
May 3, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28464749/contouring-and-dose-calculation-in-head-and-neck-cancer-radiotherapy-after-reduction-of-metal-artifacts-in-ct-images
#19
Christian Rønn Hansen, Rasmus Lübeck Christiansen, Ebbe Laugaard Lorenzen, Anders Smedegaard Bertelsen, Jon Thor Asmussen, Niels Gyldenkerne, Jesper Grau Eriksen, Jørgen Johansen, Carsten Brink
BACKGROUND: Delineation accuracy of the gross tumor volume (GTV) in radiotherapy planning for head and neck (H&N) cancer is affected by computed tomography (CT) artifacts from metal implants which obscure identification of tumor as well as organs at risk (OAR). This study investigates the impact of metal artifact reduction (MAR) in H&N patients in terms of delineation consistency and dose calculation precision in radiation treatment planning. MATERIAL AND METHODS: Tumor and OAR delineations were evaluated in planning CT scans of eleven oropharynx patients with streaking artifacts in the tumor region preceding curative radiotherapy (RT)...
June 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28455003/simultaneous-head-and-facial-computed-tomography-scans-for-assessing-facial-fractures-in-patients-with-traumatic-brain-injury
#20
Li-Kuo Huang, Hsueh Han Wang, Hsi-Feng Tu, Chih-Yuan Fu
INTRODUCTION: Patients with traumatic brain injury (TBI) may have concomitant facial fractures. While most head injury patients receive head computed tomography (CT) scans for initial evaluation, the objective of our study was to investigate the value of simultaneous facial CT scans in assessing facial fractures in patients with TBI. METHODS: From January 1, 2015 to December 31, 2015, 1649 consecutive patients presenting to our emergency department (ED) with a TBI who received CT scans using the protocol for head and facial bones were enrolled...
April 24, 2017: Injury
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