keyword
MENU ▼
Read by QxMD icon Read
search

CT imaging, increasing accuracy

keyword
https://www.readbyqxmd.com/read/28714296/-68-ga-somatostatin-analogue-pet-ct-analysis-of-costs-and-benefits-in-a-public-hospital-setting
#1
Tatiana Segard, Laurence Mja Morandeau, Elizabeth A Geelhoed, Roslyn J Francis
INTRODUCTION: Between 2009 and 2012, (68) Ga-somatostatin analogue PET-CT progressively replaced (111) In-octreotide scintigraphy for imaging neuroendocrine tumours in WA public hospitals due to published literature demonstrating improved diagnostic accuracy and increased availability. Despite significantly improved sensitivity and specificity, (68) Ga-somatostatin analogue PET is currently unfunded in Australia. This study sought to undertake cost analysis of the two modalities in a public hospital setting and to compare them with regard to patient factors such as imaging time and radiation dose...
July 17, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28713511/accuracy-of-densitometry-of-two-cone-beam-computed-tomography-equipment-in-comparison-with-computed-tomography
#2
Sina Haghanifar, Sajad Yousefi, Ehsan Moudi, Farida Abesi, Ali Bijani, Ali Akbar Moghadamnia, Mehrdad Nabahati
BACKGROUND: The use of oral implants has been growing, and cone beam computerized tomography (CBCT) has become the method of choice for oral and maxillofacial radiology. OBJECTIVE: To assess the accuracy of bone densitometry in two different CBCT devices in comparison with MDCT (multi-detector CT). METHODS: Different concentrations of urografin, including 2.5%, 5%, 7.5%, 10%, 12.5%, were prepared, and the Hounsfield unit of these solution was measured by two CBCT devices (SORDEX CRANEX 3D and NEWTOM 5G) and one spiral CT device (SOMATOM SENSATION)...
May 2017: Electronic Physician
https://www.readbyqxmd.com/read/28705410/a-level-set-approach-to-joint-image-segmentation-and-registration-with-application-to-ct-lung-imaging
#3
Piotr Swierczynski, Bartłomiej W Papież, Julia A Schnabel, Colin Macdonald
Automated analysis of structural imaging such as lung Computed Tomography (CT) plays an increasingly important role in medical imaging applications. Despite significant progress in the development of image registration and segmentation methods, lung registration and segmentation remain a challenging task. In this paper, we present a novel image registration and segmentation approach, for which we develop a new mathematical formulation to jointly segment and register three-dimensional lung CT volumes. The new algorithm is based on a level-set formulation, which merges a classic Chan-Vese segmentation with the active dense displacement field estimation...
June 15, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28702818/the-effect-of-virtual-endoscopy-on-diagnostic-accuracy-and-airway-management-strategies-in-patients-with-head-and-neck-pathology-a-prospective-cohort-study
#4
Kariem El-Boghdadly, Desire N Onwochei, Britta Millhoff, Imran Ahmad
PURPOSE: There is growing evidence to suggest a deficiency in anesthesiologists' diagnosis of airway pathology and subsequent airway management planning, and conventional instruments have not shown increases in safety. Virtual endoscopy (VE) is a tool that can detail intraluminal anatomical "fly-through" information in a format visually similar to the flexible endoscopic views familiar to anesthesiologists. We aimed to determine the effect of VE on diagnostic accuracy and airway management strategies when compared with conventional tools...
July 12, 2017: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/28688151/physical-validation-of-a-monte-carlo-based-phantom-derived-approach-to-computed-tomography-organ-dosimetry-under-tube-current-modulation
#5
Elliott J Stepusin, Daniel J Long, Kayla Ficarrotta, David Hintenlang, Wesley E Bolch
PURPOSE: To physically validate the accuracy of a Monte Carlo-based, phantom-derived methodology for computed tomography (CT) dosimetry that utilizes organ doses from pre-computed axial scans and that accounts for tube current modulation (TCM). METHODS: The output of a Toshiba Aquilion ONE CT scanner was modeled, based on physical measurement, in the Monte Carlo radiation transport code MCNPX (v2.70). CT examinations were taken of two anthropomorphic phantoms representing pediatric and adult patients (15-year-old female and adult male) at various energies, in which physical organ dose measurements were made using optically stimulated luminesce dosimeters (OSLDs)...
July 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28683837/evaluation-of-the-clinical-benefit-of-an-electromagnetic-navigation-system-for-ct-guided-interventional-radiology-procedures-in-the-thoraco-abdominal-region-compared-with-conventional-ct-guidance-ctnav-ii-study-protocol-for-a-randomised-controlled-trial
#6
R C Rouchy, A Moreau-Gaudry, E Chipon, S Aubry, L Pazart, B Lapuyade, M Durand, M Hajjam, S Pottier, B Renard, R Logier, X Orry, A Cherifi, E Quehen, G Kervio, O Favelle, F Patat, E De Kerviler, C Hughes, M Medici, J Ghelfi, A Mounier, I Bricault
BACKGROUND: Interventional radiology includes a range of minimally invasive image-guided diagnostic and therapeutic procedures that have become routine clinical practice. Each procedure involves a percutaneous needle insertion, often guided using computed tomography (CT) because of its availability and usability. However, procedures remain complicated, in particular when an obstacle must be avoided, meaning that an oblique trajectory is required. Navigation systems track the operator's instruments, meaning the position and progression of the instruments are visualised in real time on the patient's images...
July 6, 2017: Trials
https://www.readbyqxmd.com/read/28683109/18-f-fdg-pet-mr-imaging-in-patients-with-suspected-liver-lesions-value-of-liver-specific-contrast-agent-gadobenate-dimeglumine
#7
Julian Kirchner, Lino M Sawicki, Cornelius Deuschl, Johannes Grüneisen, Karsten Beiderwellen, Thomas C Lauenstein, Ken Herrmann, Michael Forsting, Philipp Heusch, Lale Umutlu
OBJECTIVES: To evaluate the added value of the application of the liver-specific contrast phase of Gadobenate dimeglumine (Gd-BOPTA) for detection and characterization of liver lesions in 18F-FDG PET/MRI. METHODS: 41 patients with histologically confirmed solid tumors and known / suspected liver metastases or not classifiable lesions in 18F-FDG PET/CT were included in this study. All patients underwent a subsequent Gd-BOPTA enhanced 18F-FDG PET/MRI examination. MRI without liver-specific contrast phase (MRI1), MRI with liver-specific contrast phase (MRI2), 18F-FDG PET/MRI without liver-specific contrast phase (PET/MRI1) and with liver-specific contrast phase (PET/MRI2) were separately evaluated for suspect lesions regarding lesion dignity, characterization, conspicuity and confidence...
2017: PloS One
https://www.readbyqxmd.com/read/28681402/effects-of-calibration-methods-on-quantitative-material-decomposition-in-photon-counting-spectral-computed-tomography-using-a-maximum-a-posteriori-estimator
#8
Tyler E Curtis, Ryan K Roeder
PURPOSE: Advances in photon-counting detectors have enabled quantitative material decomposition using multi-energy or spectral computed tomography (CT). Supervised methods for material decomposition utilize an estimated attenuation for each material of interest at each photon energy level, which must be calibrated based upon calculated or measured values for known compositions. Measurements using a calibration phantom can advantageously account for system specific noise, but the effect of calibration methods on the material basis matrix and subsequent quantitative material decomposition has not been experimentally investigated...
July 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28678818/image-quality-diagnostic-accuracy-and-potential-for-radiation-dose-reduction-in-thoracoabdominal-ct-using-sinogram-affirmed-iterative-reconstruction-safire-technique-in-a-longitudinal-study
#9
Michael Scharf, Stephanie Brendel, Katja Melzer, Christian Hentschke, Matthias May, Michael Uder, Michael M Lell
OBJECTIVE: To step-wise evaluate image quality of sinogram-affirmed iterative reconstruction (SAFIRE) in reduced-dose (RD) thoracoabdominal computed tomography (CT) compared to full-dose (FD) and RD filtered back projection (FBP) in a longitudinal study. MATERIALS AND METHODS: 122 patients were included in this prospective study. 49 patients (14 men: mean age ± SD, 56±0.4 years; 35 women: 58±1.3 years) completed FD, RD1 (80%-dose) and RD2 (60%-dose) thoracoabdominal CT...
2017: PloS One
https://www.readbyqxmd.com/read/28666904/actual-target-coverage-after-setup-verification-using-surgical-clips-compared-with-external-skin-markers-in-postoperative-breast-cancer-radiation-therapy
#10
Anke van der Salm, Lars Murrer, Inge Steenbakkers, Ruud Houben, Liesbeth J Boersma
PURPOSE: After changing from offline setup verification to online setup verification using external skin markers in breast cancer patients, we noticed an increase in localized acute skin toxicity beneath the markers. Also, in vivo 3-dimensional dose measurements showed deviations between the delivered and the planned dose distributions; therefore, we investigated the accuracy of setup verification using surgical clips in the tumor bed, with a focus on target coverage of whole breast and tumor bed...
April 19, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28665491/feasibility-of-dynamic-adaptive-passive-scattering-proton-therapy-with-computed-tomography-image-guidance-in-the-lung
#11
Shunsuke Moriya, Hidenobu Tachibana, Kenji Hotta, Naoki Nakamura, Sakae Takeji, Tetsuo Akimoto
PURPOSE: Hypo-fractionated proton beam therapy (PBT) is an approach that has been increasingly explored over the past decade. It requires high geometric accuracy for targeting of the PBT beams. However, image-guided PBT is currently commonly performed with kV X-ray images of bony anatomy. A dynamic adaptive passive scattering PBT system using computed tomography-based three-dimensional image guidance was developed, and its effectiveness was then evaluated retrospectively in patients with non-small cell lung cancer (NSCLC)...
June 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28658869/role-of-multi-detector-computed-tomography-mdct-in-preoperative-staging-of-pancreatic-carcinoma
#12
Soumil Singhal, Nirmal Kumar Prabhu, Pulkit Sethi, Srikanth Moorthy
INTRODUCTION: Pancreatic carcinoma is one of the leading causes of cancer related death in advanced countries and has shown rising trends in developing countries like India. Increase in the incidence has been linked to risk factors like lifestyle modification associated with increased alcohol consumption and rapid urbanization. Most patients at the time of diagnosis present with an advanced condition. Surgical resection offers the only chance for cure in them and imaging plays a crucial role in the early diagnosis of the condition...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28658505/fast-kvp-switching-dual-energy-contrast-enhanced-thorax-and-cardiac-ct-a-phantom-study-on-the-accuracy-of-iodine-concentration-and-effective-atomic-number-measurement
#13
Antonios E Papadakis, John Damilakis
PURPOSE: To assess the effect of vessel diameter and exposure parameters on the estimation accuracy of concentration and effective atomic number (Zeff ) of iodine (I) in contrast-enhanced thorax and cardiac dual-energy CT using a modern fast kVp-switching CT scanner. METHODS: A standard semi-anthropomorphic cardiac CT phantom devised to simulate the human chest at three different body habitus i.e. medium-sized, large-sized, and obese, was scanned using a fast kVp-switching Revolution-GSI GE CT scanner...
June 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/28657201/comparison-of-low-and-ultra-low-dose-computed-tomography-protocols-for-quantitative-lung-and-airway-assessment
#14
Emily Hammond, Chelsea Sloan, John D Newell, Jered P Sieren, Melissa Saylor, Craig Vidal, Shayna Hogue, Frank De Stefano, Alexa Sieren, Eric A Hoffman, Jessica C Sieren
PURPOSE: Quantitative computed tomography (CT) measures are increasingly being developed and used to characterize lung disease. With recent advances in CT technologies, we sought to evaluate the quantitative accuracy of lung imaging at low and ultra-low radiation doses with the use of iterative reconstruction (IR), tube current modulation (TCM), and spectral shaping. METHODS: We investigated the effect of five independent CT protocols reconstructed with IR on quantitative airway measures and global lung measures using an in-vivo large animal model as a human subject surrogate...
June 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/28657157/cyberknife-with-integrated-ct-on-rails-system-description-and-first-clinical-application-for-pancreas-sbrt
#15
Chrysi Papalazarou, Gijsbert J Klop, Maaike T W Milder, Johannes P A Marijnissen, Vikas Gupta, Ben J M Heijmen, Joost J M E Nuyttens, Mischa S Hoogeman
PURPOSE: This paper reports on the integration of a sliding-gantry CT-on-rails with a robotic linear accelerator. METHODS: The system consists of a SOMATOM Definition AS CT scanner (Siemens Healthcare, Forchheim, Germany) and a CyberKnife M6 FIM (Accuray, Inc., Sunnyvale, CA, USA). Additional movement programs were implemented in the robotic treatment table (RoboCouch, Accuray Inc.) to move between CT and treatment position. Acceptance testing was performed on the CT scanner according to AAPM83 guidelines, as well as safety tests for collision avoidance and electromagnetic (EM) compatibility...
June 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/28651071/an-independent-active-contours-segmentation-framework-for-bone-micro-ct-images
#16
Vasileios Ch Korfiatis, Simone Tassani, George K Matsopoulos
Micro-CT is an imaging technique for small tissues and objects that is gaining increased popularity especially as a pre-clinical application. Nevertheless, there is no well-established micro-CT segmentation method, while typical procedures lack sophistication and frequently require a degree of manual intervention, leading to errors and subjective results. To address these issues, a novel segmentation framework, called Independent Active Contours Segmentation (IACS), is proposed in this paper. The proposed IACS is based on two autonomous modules, namely automatic ROI extraction and IAC Evolution, which segments the ROI image using multiple Active Contours that evolve simultaneously and independently of one another...
June 19, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28650133/imaging-in-primary-hyperparathyroidism-focus-on-the-evidence-based-diagnostic-performance-of-different-methods
#17
Giorgio Treglia, Pierpaolo Trimboli, Martin Huellner, Luca Giovanella
BACKGROUND: Primary hyperparathyroidism (PHPT) is a common endocrine disorder usually due to hyperfunctioning parathyroid glands (HP). Surgical removal of HP is the main treatment in PHPT, particularly in symptomatic patients. The correct detection and localization of HP is challenging and crucial as it may guide surgical treatment in patients with PHPT. To date, different imaging methods have been used to detect and localize HP in patients with PHPT including radiology, nuclear medicine and hybrid techniques...
June 23, 2017: Minerva Endocrinologica
https://www.readbyqxmd.com/read/28641952/the-effect-of-tissue-segmented-attenuation-maps-on-pet-quantification-with-a-special-focus-on-large-arteries
#18
A Mota-Cobian, J C Alonso-Farto, L Fernández-Friera, J Sánchez-González, B López-Melgar, L J Jiménez-Borreguero, V Fuster, J Ruiz-Cabello, S España
OBJECTIVES: Accuracy on quantitative PET image analysis relies on the correct application of attenuation correction which is one of the major challenges for PET/MRI that remains to be solved. The purpose of this study is to evaluate the effect of MRI-based attenuation maps and the use of flexible coils on the quantitative accuracy of PET images with a special focus on large arteries. MATERIALS AND METHODS: PET/CT data from eight oncologic patients was used. PET data was reconstructed using attenuation maps with different level of detail emulating several approaches available on current PET/MRI scanners...
June 19, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28627989/computed-tomography-detection-of-extracapsular-spread-of-squamous-cell-carcinoma-of-the-head-and-neck-in-metastatic-cervical-lymph-nodes
#19
Joshua A Carlton, Adam W Maxwell, Lyndsey B Bauer, Sara M McElroy, Lester J Layfield, Humera Ahsan, Ajay Agarwal
Background and purpose In patients with squamous cell carcinoma of the head and neck (HNSCC), extracapsular spread (ECS) of metastases in cervical lymph nodes affects prognosis and therapy. We assessed the accuracy of intravenous contrast-enhanced computed tomography (CT) and the utility of imaging criteria for preoperative detection of ECS in metastatic cervical lymph nodes in patients with HNSCC. Materials and methods Preoperative intravenous contrast-enhanced neck CT images of 93 patients with histopathological HNSCC metastatic nodes were retrospectively assessed by two neuroradiologists for ECS status and ECS imaging criteria...
June 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28624849/the-accuracy-of-68-ga-psma-pet-ct-in-primary-lymph-node-staging-in-high-risk-prostate-cancer
#20
Can Öbek, Tünkut Doğanca, Emre Demirci, Meltem Ocak, Ali Rıza Kural, Asıf Yıldırım, Uğur Yücetaş, Çetin Demirdağ, Sarper M Erdoğan, Levent Kabasakal
PURPOSE: To assess the diagnostic accuracy of (68)Ga-PSMA PET in predicting lymph node (LN) metastases in primary N staging in high-risk and very high-risk nonmetastatic prostate cancer in comparison with morphological imaging. METHODS: This was a multicentre trial of the Society of Urologic Oncology in Turkey in conjunction with the Nuclear Medicine Department of Cerrahpasa School of Medicine, Istanbul University. Patients were accrued from eight centres. Patients with high-risk and very high-risk disease scheduled to undergo surgical treatment with extended LN dissection between July 2014 and October 2015 were included...
June 18, 2017: European Journal of Nuclear Medicine and Molecular Imaging
keyword
keyword
32251
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"