keyword
MENU ▼
Read by QxMD icon Read
search

CT imaging, increasing accuracy

keyword
https://www.readbyqxmd.com/read/28813561/comparison-of-coronary-ct-angiography-spect-pet-and-hybrid-imaging-for-diagnosis-of-ischemic-heart-disease-determined-by-fractional-flow-reserve
#1
Ibrahim Danad, Pieter G Raijmakers, Roel S Driessen, Jonathon Leipsic, Rekha Raju, Chris Naoum, Juhani Knuuti, Maija Mäki, Richard S Underwood, James K Min, Kimberly Elmore, Wynand J Stuijfzand, Niels van Royen, Igor I Tulevski, Aernout G Somsen, Marc C Huisman, Arthur A van Lingen, Martijn W Heymans, Peter M van de Ven, Cornelis van Kuijk, Adriaan A Lammertsma, Albert C van Rossum, Paul Knaapen
Importance: At present, the choice of noninvasive testing for a diagnosis of significant coronary artery disease (CAD) is ambiguous, but nuclear myocardial perfusion imaging with single-photon emission tomography (SPECT) or positron emission tomography (PET) and coronary computed tomography angiography (CCTA) is predominantly used for this purpose. However, to date, prospective head-to-head studies are lacking regarding the diagnostic accuracy of these imaging modalities. Furthermore, the combination of anatomical and functional assessments configuring a hybrid approach may yield improved accuracy...
August 16, 2017: JAMA Cardiology
https://www.readbyqxmd.com/read/28810259/reliability-reproducibility-and-prognostic-accuracy-of-the-alberta-stroke-program-early-ct-score-on-ct-perfusion-and-non-contrast-ct-in-hyperacute-stroke
#2
Jillian Naylor, Leonid Churilov, Ziyuan Chen, Miriam Koome, Neil Rane, Bruce C V Campbell
BACKGROUND: Alberta Stroke Program Early CT Score (ASPECTS) assesses early ischemic change on non-contrast CT (NCCT). We hypothesised that assessing ASPECTS regions on CT Perfusion (CTP) rather than NCCT would improve inter-rater agreement and prognostic accuracy, particularly in patients presenting early after stroke onset. METHODS: Ischemic stroke patients treated with intravenous alteplase from 2009 to 2014 at our institution were included in this study. Inter-rater agreement and prognostic accuracy of ASPECTS across modalities were analysed by the time between stroke onset and initial NCCT, dichotomized 1st quartile versus quartiles 2-4, referred to as epochs...
August 16, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/28807441/whole-body-dose-and-energy-measurements-in-radiotherapy-by-a-combination-of-lif-mg-cu-p-and-lif-mg-ti
#3
Pascal Hauri, Uwe Schneider
PURPOSE: Long-term survivors of cancer who were treated with radiotherapy are at risk of a radiation-induced tumor. Hence, it is important to model the out-of-field dose resulting from a cancer treatment. These models have to be verified with measurements, due to the small size, the high sensitivity to ionizing radiation and the tissue-equivalent composition, LiF thermoluminescence dosimeters (TLD) are well-suited for out-of-field dose measurements. However, the photon energy variation of the stray dose leads to systematic dose errors caused by the variation in response with radiation energy of the TLDs...
August 11, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28803447/registration-free-automatic-identification-of-gold-fiducial-markers-in-mri-target-delineation-images-for-prostate-radiotherapy
#4
Christian Gustafsson, Juha Korhonen, Emilia Persson, Adalsteinn Gunnlaugsson, Tufve Nyholm, Lars E Olsson
PURPOSE: The superior soft tissue contrast of magnetic resonance imaging (MRI) compared to computed tomography (CT) has urged the integration of MRI and elimination of CT in radiotherapy treatment (RT) for prostate. An intraprostatic gold fiducial marker (GFM) appear hyperintense on CT. On T2 weighted (T2w) MRI target delineation images the GFM appear as a small signal void similar to calcifications and post biopsy fibrosis. It can therefore be difficult to identify the markers without CT...
August 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28803217/accurate-model-based-segmentation-of-gynecologic-brachytherapy-catheter-collections-in-mri-images
#5
Andre Mastmeyer, Guillaume Pernelle, Ruibin Ma, Lauren Barber, Tina Kapur
The gynecological cancer mortality rate, including cervical, ovarian, vaginal and vulvar cancers, is more than 20,000 annually in the US alone. In many countries, including the US, external-beam radiotherapy followed by high dose rate brachytherapy is the standard-of-care. The superior ability of MR to visualize soft tissue has led to an increase in its usage in planning and delivering brachytherapy treatment. A technical challenge associated with the use of MRI imaging for brachytherapy, in contrast to that of CT imaging, is the visualization of catheters that are used to place radiation sources into cancerous tissue...
July 18, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28799874/limitations-of-multidetector-computed-tomography-angiography-for-the-diagnosis-of-blunt-cerebrovascular-injury
#6
Ramesh Grandhi, Gregory M Weiner, Nitin Agarwal, David M Panczykowski, William J Ares, Jesse S Rodriguez, Jonathan A Gelfond, John G Myers, Louis H Alarcon, David O Okonkwo, Brian T Jankowitz
OBJECTIVE Blunt cerebrovascular injuries (BCVIs) following trauma carry risk for morbidity and mortality. Since patients with BCVI are often asymptomatic at presentation and neurological sequelae often occur within 72 hours, timely diagnosis is essential. Multidetector CT angiography (CTA) has been shown to be a noninvasive, cost-effective, reliable means of screening; however, the false-positive rate of CTA in diagnosing patients with BCVI represents a key drawback. Therefore, the authors assessed the role of DSA in the screening of BCVI when utilizing CTA as the initial screening modality...
August 11, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28799104/accuracy-of-837-pedicle-screw-positions-in-degenerative-lumbar-spine-with-conventional-open-surgery-evaluated-by-computed-tomography
#7
Ilkka Saarenpää, Timo Laine, Jussi Hirvonen, Saija Hurme, Esa Kotilainen, Jaakko Rinne, Katariina Korhonen, Janek Frantzén
BACKGROUND: The spatial and directional accuracy of the positioning of pedicle screws in the lumbosacral spine with conventional open surgery assessed by computed tomography (CT) has been published in several studies, systematic reviews and meta-analyses with a short-term follow-up. Inaccurate pedicle screw insertion may cause neurologic symptoms and weakens the construct. METHODS: The data of 147 patients operated on with transpedicular screw fixation based on anatomical landmarks, supported by fluoroscopy, by a senior neurosurgeon in our clinic between 2000 and 2010 were analyzed retrospectively...
August 10, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28771540/18f-fdg-pet-ct-for-the-detection-of-disease-in-patients-with-head-and-neck-cancer-treated-with-radiotherapy
#8
Nils Helsen, Dessie Roothans, Bert Van Den Heuvel, Tim Van den Wyngaert, Danielle Van den Weyngaert, Laurens Carp, Sigrid Stroobants
OBJECTIVE: The aim of this study is to evaluate the diagnostic performance of FDG-PET/CT for the detection of residual disease after (chemo)radiotherapy in patients with head and neck squamous cell carcinoma (HNSCC) and to evaluate the prognostic value of the FDG-PET/CT findings. METHODS: Patients with HNSCC who underwent FDG-PET/CT after (chemo)radiotherapy were studied retrospectively. RESULTS: 104 FDG-PET/CT-scans were performed at a median of 13...
2017: PloS One
https://www.readbyqxmd.com/read/28753380/ct-and-mr-imaging-of-gynecologic-emergencies
#9
Yuko Iraha, Masahiro Okada, Rin Iraha, Kimei Azama, Tsuneo Yamashiro, Maho Tsubakimoto, Yoichi Aoki, Sadayuki Murayama
Gynecologic emergencies include various diseases that result from adnexal and uterine disorders. Adnexal disorders may be classified into the following three categories: (a) disorders that cause hemorrhage (hemorrhagic ovarian cysts and ectopic pregnancies); (b) disorders related to adnexal tumors (adnexal torsion and rupture of ovarian tumors); and (c) disorders related to pelvic inflammatory disease, such as tubo-ovarian abscesses. Unusual adnexal torsion, such as massive ovarian edema, isolated fallopian tube torsion, and paraovarian cyst torsion, has also been described...
July 28, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28740677/assessment-of-thoracic-vasculature-in-patients-with-central-bronchogenic-carcinoma-by-unenhanced-magnetic-resonance-angiography-comparison-between-2d-free-breathing-truefisp-2d-breath-hold-truefisp-and-3d-respiratory-triggered-space
#10
Lili Wang, Peng Lv, Shuohui Yang, Mengsu Zeng, Jiang Lin
BACKGROUND: Preoperative assessment of the integrity of major thoracic vessels in central bronchogenic carcinoma is vital for tumor staging and treatment planning. Contrast-enhanced CT is currently the first choice of modality for this purpose in clinical practice with limitations including exposure to ionizing radiation and the use of iodinated contrast material. MRI has been increasingly employed for the staging of lung cancer. More recently, unenhanced magnetic resonance angiography (MRA) which is totally non-invasive and contrast-free has been reported able to show thoracic vessels...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28740565/whole-body-low-dose-computed-tomography-wbldct-in-assessment-of-patients-with-multiple-myeloma-pilot-study-and-standard-imaging-protocol-suggestion
#11
Robert Chrzan, Artur Jurczyszyn, Andrzej Urbanik
BACKGROUND: For decades, the main imaging tool in multiple myeloma (MM) patients was plain radiography. However, computed tomography (CT) has been included in the updated criteria of MM. The main disadvantage of CT is a considerably high radiation dose. Therefore, low-dose CT protocols could be a solution. The aim of the study was to (1) preliminarily analyse the usefulness of Whole-Body Low-Dose CT (WBLDCT) in the evaluation of patients with MM and (2) to make adjustments in the standard CT imaging protocol...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28740451/mri-reduces-variation-of-contouring-for-boost-clinical-target-volume-in-breast-cancer-patients-without-surgical-clips-in-the-tumour-bed
#12
Noora Al-Hammadi, Palmira Caparrotti, Saju Divakar, Mohamed Riyas, Suparna Halsnad Chandramouli, Rabih Hammoud, Jillian Hayes, Maeve Mc Garry, Satheesh Prasad Paloor, Primoz Petric
BACKGROUND: Omitting the placement of clips inside tumour bed during breast cancer surgery poses a challenge for delineation of lumpectomy cavity clinical target volume (CTVLC). We aimed to quantify inter-observer variation and accuracy for CT- and MRI-based segmentation of CTVLC in patients without clips. PATIENTS AND METHODS: CT- and MRI-simulator images of 12 breast cancer patients, treated by breast conserving surgery and radiotherapy, were included in this study...
June 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/28733959/increasing-precision-of-clinical-diagnosis-of-alzheimer-s-disease-using-a-combined-algorithm-incorporating-clinical-and-novel-biomarker-data
#13
REVIEW
Marwan N Sabbagh, Lih-Fen Lue, Daniel Fayard, Jiong Shi
Establishing the in vivo diagnosis of Alzheimer's disease (AD) or other dementias relies on clinical criteria; however, the accuracy of these criteria can be limited. The diagnostic accuracy is 77% for a clinical diagnosis of AD, even among experts. We performed a review through PubMed of articles related to specific diagnostic modalities, including APOE genotyping, cerebrospinal fluid (CSF) testing, fludeoxyglucose F 18 positron emission tomography (PET), amyloid PET, tau PET, computed tomography (CT), single-photon emission CT, magnetic resonance imaging (MRI), and B12 and thyroid-stimulating hormone screening, to determine the specificity and sensitivity of each test used in the clinical diagnosis of AD...
July 2017: Neurology and Therapy
https://www.readbyqxmd.com/read/28722700/detection-of-bone-marrow-edema-pattern-with-dual-energy-computed-tomography-of-the-pig-mandible-treated-with-radiotherapy-and-surgery-compared-with-magnetic-resonance-imaging
#14
COMPARATIVE STUDY
Lucas J Poort, Annika A R Stadler, Johan H B Ludlage, Frank J P Hoebers, Peter A W H Kessler, Alida A Postma
OBJECTIVE: The aim of the study was to investigate the accuracy of dual-energy computed tomography (DECT) compared with magnetic resonance (MR) imaging for the detection of edema of the mandible. MATERIALS AND METHODS: Fifteen adult Göttingen mini pigs received irradiation to the mandible with an equivalent dose of 0, 25, 50, or 70 Gy. Six months after irradiation, all animals underwent DECT and MR imaging of the mandible. Magnetic resonance short tau inversion recovery (STIR) was used for the grading of the bone marrow edema (0-3)...
July 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28714296/-68-ga-somatostatin-analogue-pet-ct-analysis-of-costs-and-benefits-in-a-public-hospital-setting
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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"