keyword
MENU ▼
Read by QxMD icon Read
search

CT imaging, increasing accuracy

keyword
https://www.readbyqxmd.com/read/28345211/3d-echocardiographic-analysis-of-aortic-annulus-for-transcatheter-aortic-valve-replacement-using-novel-aortic-valve-quantification-software-comparison-with-computed-tomography
#1
Anuj Mediratta, Karima Addetia, Diego Medvedofsky, Robert J Schneider, Eric Kruse, Atman P Shah, Sandeep Nathan, Jonathan D Paul, John E Blair, Takeyoshi Ota, Husam H Balkhy, Amit R Patel, Victor Mor-Avi, Roberto M Lang
BACKGROUND: With the increasing use of transcatheter aortic valve replacement (TAVR) in patients with aortic stenosis (AS), computed tomography (CT) remains the standard for annulus sizing. However, 3D transesophageal echocardiography (TEE) has been an alternative in patients with contraindications to CT. We sought to (1) test the feasibility, accuracy, and reproducibility of prototype 3DTEE analysis software (Philips) for aortic annular measurements and (2) compare the new approach to the existing echocardiographic techniques...
March 27, 2017: Echocardiography
https://www.readbyqxmd.com/read/28323641/metal-artifacts-in-computed-tomography-for-radiation-therapy-planning-dosimetric-effects-and-impact-of-metal-artifact-reduction
#2
Drosoula Giantsoudi, Bruno De Man, Joost Verburg, Alexei Trofimov, Yannan Jin, Ge Wang, Lars Gjesteby, Harald Paganetti
A significant and increasing number of patients receiving radiation therapy present with metal objects close to, or even within, the treatment area, resulting in artifacts in computed tomography (CT) imaging, which is the most commonly used imaging method for treatment planning in radiation therapy. In the presence of metal implants, such as dental fillings in treatment of head-and-neck tumors, spinal stabilization implants in spinal or paraspinal treatment or hip replacements in prostate cancer treatments, the extreme photon absorption by the metal object leads to prominent image artifacts...
March 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28316309/high-resolution-ct-angiogram-for-lower-extremity-vein-mapping
#3
Mark P Wright, Matthew R Smeds, Lonnie Wright, Ahsan T Ali
High-resolution CT angiogram (CTA) has replaced traditional diagnostic angiography as the main preoperative imaging modality for vascular surgery patients. Although the use of CTA is increasing for arterial imaging, it has not been used routinely for vein mapping. The goal of this study was to evaluate the accuracy of CTA for venous anatomy and compare it to a standard venous duplex ultrasound (DUS). When the vein was used for bypass, the quality and size of the vein were evaluated in the operating room. As part of a preoperative workup before lower extremity revascularization, 16 patients underwent a CTA followed by a DUS...
March 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28302761/performance-characteristics-of-the-whole-body-discovery-iq-pet-ct-system
#4
Gabriel Reynes-Llompart, Cristina Gámez-Cenzano, Inma Romero-Zayas, Laura Rodriguez-Bel, José Luís Vercher-Conejero, Josep M Martí-Climent
Purpose: The aim of this study was to assess the physical performance of a new PET/CT system Discovery IQ 5 Rings (General Electric, Milwaukee, WI). Methods: Performance measurements were obtained using the NEMA NU2-2012 methodology. Image quality was extended by accounting for different acquisition parameters (lesion-to-background ratios of 8:1, 4:1 and 2:1 and acquisition times) as well as different reconstruction algorithms (VPHD, VPHD-S and Q.Clear). Tomographic reconstruction was also assessed using a Jaszczak phantom...
March 16, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28301584/diagnostic-accuracy-and-added-value-of-dual-energy-subtraction-radiography-compared-to-standard-conventional-radiography-using-computed-tomography-as-standard-of-reference
#5
Katharina Martini, Marco Baessler, Stephan Baumueller, Thomas Frauenfelder
PURPOSE: To retrospectively evaluate diagnostic performance of dual-energy subtraction radiography (DESR) for interpretation of chest radiographs compared to conventional radiography (CR) using computed tomography (CT) as standard of reference. MATERIAL AND METHODS: A total of 199 patients (75 female, median age 67) were included in this institutional review board (IRB)-approved clinical trial. All patients were scanned in posteroanterior and lateral direction with dual-shot DE-technique...
2017: PloS One
https://www.readbyqxmd.com/read/28297437/implementation-and-evaluation-of-a-protocol-management-system-for-automated-review-of-ct-protocols
#6
Joshua Grimes, Shuai Leng, Yi Zhang, Thomas Vrieze, Cynthia McCollough
Protocol review is important to decrease the risk of patient injury and increase the consistency of CT image quality. A large volume of CT protocols makes manual review labor-intensive, error-prone, and costly. To address these challenges, we have developed a software system for automatically managing and monitoring CT protocols on a frequent basis. This article describes our experiences in the implementation and evaluation of this protocol monitoring system. In particular, we discuss various strategies for addressing each of the steps in our protocol-monitoring workflow, which are: maintaining an accurate set of master protocols, retrieving protocols from the scanners, comparing scanner protocols to master protocols, reviewing flagged differences between the scanner and master protocols, and updating the scanner and/or master protocols...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297315/practical-considerations-for-noise-power-spectra-estimation-for-clinical-ct-scanners
#7
Steven Dolly, Hsin-Chen Chen, Mark Anastasio, Sasa Mutic, Hua Li
Local noise power spectra (NPS) have been commonly calculated to represent the noise properties of CT imaging systems, but their properties are significantly affected by the utilized calculation schemes. In this study, the effects of varied calculation parameters on the local NPS were analyzed, and practical suggestions were provided regarding the estimation of local NPS for clinical CT scanners. The uniformity module of a Catphan phantom was scanned with a Philips Brilliance 64 slice CT simulator with varied scanning protocols...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296683/preoperative-computed-tomography-assessment-for-perinephric-fat-invasion-comparison-with-pathological-staging
#8
Jaime Landman, Jae Young Park, Chenhui Zhao, Molly Baker, Martin Hofmann, Mohammad Helmy, Chandana Lall, Mari Bozoghlanian, Zhamshid Okhunov
OBJECTIVE: The aim of this study was to assess the accuracy of computed tomography (CT) imaging in diagnosing perinephric fat (PNF) invasion in patients with renal cell carcinoma. METHODS: We retrospectively reviewed the medical records and preoperative CT images of 161 patients (105 men and 56 women) for pT1-pT3a renal cell carcinoma. We analyzed the predictive accuracy of CT criteria for PNF invasion stratified by tumor size. We determined the predictive value of CT findings in diagnosing PNF invasion using logistic regression analysis...
March 15, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28296324/the-feasibility-of-atlas-based-automatic-segmentation-of-mri-for-h-n-radiotherapy-planning
#9
Kieran Wardman, Robin J D Prestwich, Mark J Gooding, Richard J Speight
Atlas-based autosegmentation is an established tool for segmenting structures for CT-planned head and neck radiotherapy. MRI is being increasingly integrated into the planning process. The aim of this study is to assess the feasibility of MRI-based, atlas-based autosegmentation for organs at risk (OAR) and lymph node levels, and to compare the segmentation accuracy with CT-based autosegmentation. Fourteen patients with locally advanced head and neck cancer in a prospective imaging study underwent a T1-weighted MRI and a PET-CT (with dedicated contrast-enhanced CT) in an immobilization mask...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295413/using-a-handheld-stereo-depth-camera-to-overcome-limited-field-of-view-in-simulation-imaging-for-radiation-therapy-treatment-planning
#10
Cesare Jenkins, Lei Xing, Amy Yu
PURPOSE: A correct body contour is essential for reliable treatment planning in radiation therapy. While modern medical imaging technologies provide highly accurate patient modeling, there are times when a patient's anatomy cannot be fully captured or there is a lack of easy access to computed tomography (CT) simulation. Here we provide a practical solution to the surface contour truncation problem by using a handheld stereo depth camera (HSDC) to obtain the missing surface anatomy and a surface-surface image registration to stich the surface data into the CT dataset for treatment planning...
March 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28283997/decision-support-system-for-detection-of-papilledema-through-fundus-retinal-images
#11
Shahzad Akbar, Muhammad Usman Akram, Muhammad Sharif, Anam Tariq, Ubaid Ullah Yasin
A condition in which the optic nerve inside the eye is swelled due to increased intracranial pressure is known as papilledema. The abnormalities due to papilledema such as opacification of Retinal Nerve Fiber Layer (RNFL), dilated optic disc capillaries, blurred disc margins, absence of venous pulsations, elevation of optic disc, obscuration of optic disc vessels, dilation of optic disc veins, optic disc splinter hemorrhages, cotton wool spots and hard exudates may result in complete vision loss. The ophthalmologists detect papilledema by means of an ophthalmoscope, Computed Tomography (CT), Magnetic Resonance Imaging (MRI) and ultrasound...
April 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28282381/the-diagnostic-accuracy-of-a-single-cea-blood-test-in-detecting-colorectal-cancer-recurrence-results-from-the-facs-trial
#12
Bethany Shinkins, Brian D Nicholson, John Primrose, Rafael Perera, Timothy James, Sian Pugh, David Mant
OBJECTIVE: To evaluate the diagnostic accuracy of a single CEA (carcinoembryonic antigen) blood test in detecting colorectal cancer recurrence. BACKGROUND: Patients who have undergone curative resection for primary colorectal cancer are typically followed up with scheduled CEA testing for 5 years. Decisions to investigate further (usually by CT imaging) are based on single test results, reflecting international guidelines. METHODS: A secondary analysis was undertaken of data from the FACS trial (two arms included CEA testing)...
2017: PloS One
https://www.readbyqxmd.com/read/28276077/quantifying-the-reproducibility-of-lung-ventilation-images-between-4-dimensional-cone-beam-ct-and-4-dimensional-ct
#13
Henry C Woodruff, Chun-Chien Shieh, Fiona Hegi-Johnson, Paul J Keall, John Kipritidis
PURPOSE: Deformable image registration (DIR) based computed tomography ventilation imaging derived from four-dimensional cone-beam CT (CTVI(4)(DCBCT) ) can complement existing 4DCT-based methods (CTVI(4)(DCT) ) to track lung function changes over a course of lung cancer radiation therapy. However the accuracy of CTVI(4)(DCBCT) needs to be assessed since anatomic 4DCBCT has demonstrably poor image quality and small field of view (FOV) compared to treatment planning 4DCT. We perform a direct comparison between short interval CTVI(4)(DCBCT) and CTVI(4)(DCT) pairs to understand the patient specific image quality factors affecting the intermodality CTVI reproducibility in the clinic...
March 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/28275705/distraction-in-diagnostic-radiology-how-is-search-through-volumetric-medical-images-affected-by-interruptions
#14
Lauren H Williams, Trafton Drew
Observational studies have shown that interruptions are a frequent occurrence in diagnostic radiology. The present study used an experimental design in order to quantify the cost of these interruptions during search through volumetric medical images. Participants searched through chest CT scans for nodules that are indicative of lung cancer. In half of the cases, search was interrupted by a series of true or false math equations. The primary cost of these interruptions was an increase in search time with no corresponding increase in accuracy or lung coverage...
2017: Cogn Res Princ Implic
https://www.readbyqxmd.com/read/28271395/comparing-pre-therapeutic-124-i-and-131-i-uptake-tests-with-intra-therapeutic-131-i-uptake-in-benign-thyroid-disorders
#15
Falk Gühne, Christian Kühnel, Martin Freesmeyer
PURPOSE: (124)I-PET/CT can be used for pre-therapeutic assessment of radioactive iodine uptake in benign thyroid disorders, however systematic comparisons with intra-therapeutic uptake are still lacking for these disorders. The goals of this study were to compare (124)I RAIU and conventional (131)I RAIU tests with each other; to compare both tests with intra-therapeutic uptake (reference); and to verify the time course of radioactive iodine uptake at three time points (30, 102, and 336 h [14 days] post administration; p...
March 7, 2017: Endocrine
https://www.readbyqxmd.com/read/28265229/contribution-of-diffusion-weighted-mri-to-diagnosis-and-staging-in-gastric-tumors-and-comparison-with-multi-detector-computed-tomography
#16
Harun Arslan, Mehmet Fatih Özbay, İskan Çallı, Erkan Doğan, Sebahattin Çelik, Abdussamet Batur, Aydın Bora, Alpaslan Yavuz, Mehmet Deniz Bulut, Mesut Özgökçe, Mehmet Çetin Kotan
BACKGROUND: Diagnostic performance of Diffusion-Weighted magnetic resonance Imaging (DWI) and Multi-Detector Computed Tomography (MDCT) for TNM (Tumor, Lymph node, Metastasis) staging of gastric cancer was compared. PATIENTS AND METHODS: We used axial T2-weighted images and DWI (b-0,400 and b-800 s/mm2) protocol on 51 pre-operative patients who had been diagnosed with gastric cancer. We also conducted MDCT examinations on them. We looked for a signal increase in the series of DWI images...
March 1, 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/28256439/automated-bone-subtraction-image-analysis-software-package-for-improved-and-faster-ct-monitoring-of-longitudinal-spine-involvement-in-patients-with-multiple-myeloma
#17
Marius Horger, Hendrick Ditt, Shu Liao, Katja Weisel, Jan Fritz, Wolfgang M Thaiss, Sascha Kaufmann, Konstantin Nikolaou, Christopher Kloth
RATIONALE AND OBJECTIVES: The study aimed to assess the diagnostic benefit of a novel computed tomography (CT) post-processing software generating subtraction maps of longitudinal non-enhanced CT examinations for monitoring the course of myeloma bone disease in the spine. MATERIALS AND METHODS: The local institutional review board approved the retrospective data evaluation. Included were 82 consecutive myeloma patients (46 male; mean age, 65.08 ± 9.76) who underwent 188 repeated whole-body reduced-dose Multislice Detector Computed Tomography (MDCT) at our institution between December 2013 and January 2016...
February 27, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28250281/why-a-catheter-can-be-correctly-placed-in-the-anterior-horn-of-lateral-ventricle-by-inserting-perpendicular-to-the-frontal-bone-on-the-ventricular-drainage-demonstration-of-the-accuracy-of-an-inserting-path-by-computed-tomographic-image-study-and-clinical-practices
#18
Kiyonobu Ikeda, Takashi Asahi, Takaaki Iida, Jiro Yamamoto, Tsuyoshi Tsukada, Nobutaka Yamamoto, Fumihiko Takeuchi, Shigeru Munemoto, Shu-Ji Sato, Shuichi Akaike, Katsuo Shoin
Why a catheter can be correctly placed in the ventricle by inserting perpendicular to the frontal bone on the ventricular drainage? We performed a study on the accuracy of a path perpendicular to the skull surface into the anterior horn using computed tomography (CT), and a clinical study. Twenty patients were studied on CT images. Using the curved multi-planar reconstruction method, the curved frontal skull and brain were reconstructed to flat structures, and perpendicular lines were drawn from the flat surface to the foramen of Monro on the reconstructed images...
March 2, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/28249314/dual-energy-cta-in-patients-with-symptomatic-peripheral-arterial-occlusive-disease-study-of-diagnostic-accuracy-and-impeding-factors
#19
Thorsten Klink, Theresa Wilhelm, Christine Roth, Johannes T Heverhagen
Purpose The purpose of this study was to assess the diagnostic performance of dual-energy CT angiography (DE-CTA) in patients with symptomatic peripheral artery occlusive disease (PAOD) and to identify factors that impede its diagnostic accuracy. Materials and Methods Dual-source DE-CTA scans of the lower extremities of 94 patients were retrospectively compared to the diagnostic reference standard, digital subtraction angiography (DSA). Two independent observers assessed PAOD incidence, image quality, artifacts, and diagnostic accuracy of DE-CTA in 1014 arterial segments on axial, combined 80/140 kVp reconstructions and on 3 D maximum intensity projections (MIP) after automated bone and plaque removal...
March 1, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28244927/accuracy-and-reliability-of-computed-tomography-and-magnetic-resonance-imaging-compared-with-true-anatomic-femoral-version
#20
Michael J Beebe, James D Wylie, Bill G Bodine, Ashley L Kapron, Travis G Maak, Omer Mei-Dan, Stephen K Aoki
BACKGROUND: Abnormal torsion of the femur is correlated to lower extremity pathologies. Although computed tomography (CT) scan is the gold standard torsional measurement, magnetic resonance imaging (MRI) is proposed as a viable alternative. Our aim was to determine the accuracy and consistency of MRI and CT femur rotational studies based on 4 described protocols. METHODS: Twelve cadaveric femora were stripped of soft tissue before imaging and physical assessment of torsion...
February 27, 2017: Journal of Pediatric Orthopedics
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"