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BMC Medical Imaging

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https://www.readbyqxmd.com/read/28514940/the-effect-of-initial-teaching-on-evaluation-of-left-ventricular-volumes-by-cardiovascular-magnetic-resonance-imaging-comparison-between-complete-and-intermediate-beginners-and-experienced-observers
#1
Erik Hedström, Masaki Ishida, Alvaro Sepúlveda-Martínez, Daniel Salehi, Johannes Sperling, Henrik Engblom, Eike Nagel
BACKGROUND: High reproducibility and low intra- and interobserver variability are important strengths of cardiac magnetic resonance (CMR). In clinical practice a significant learning curve may however be observed. Basic CMR courses offer an average of 1.4 h dedicated to lecturing and demonstrating left ventricular (LV) function analysis. The purpose of this study was to evaluate the effect of initial teaching on complete and intermediate beginners' quantitative measurements of LV volumes and function by CMR...
May 17, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28486977/rapid-cartesian-versus-radial-acquisition-comparison-of-two-sequences-for-hepatobiliary-phase-mri-at-3-tesla-in-patients-with-impaired-breath-hold-capabilities
#2
Johannes Budjan, Philipp Riffel, Melissa M Ong, Stefan O Schoenberg, Ulrike I Attenberger, Daniel Hausmann
BACKGROUND: Hepatocyte-specific gadolinium based contrast agents (HSCA) provide substantial information for the classification of liver lesions in magnetic resonance imaging (MRI). However, breathing artifacts which reduce image quality and diagnostic confidence of hepatobiliary phase acquisitions are regularly observed in clinical routine. The aim of this study was to evaluate two approaches to reduce breathing artifacts for hepatobiliary phase imaging. METHODS: Twenty minutes after administration of a HSCA (gadoxetic acid), a T1-weighted VIBE sequence with radial k-space sampling (radialVIBE, 180 s acquisition time in free breathing) and a highly accelerated Cartesian VIBE with Dixon fat separation (CD-VIBE, CAIPIRINHA acceleration with r = 2 × 2, breath-hold 8-10 s) were acquired in 35 patients (12 female, 57 ± 13 years), who showed breath-holding difficulties in early phases of the examinations...
May 9, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28482817/evaluation-of-patients-with-painful-total-hip-arthroplasty-using-combined-single-photon-emission-tomography-and-conventional-computerized-tomography-spect-ct-a-comparison-of-semi-quantitative-versus-3d-volumetric-quantitative-measurements
#3
Emilienne Barthassat, Faik Afifi, Praveen Konala, Helmut Rasch, Michael T Hirschmann
BACKGROUND: It was the primary purpose of our study to evaluate the inter- and intra-observer reliability of a standardized SPECT/CT algorithm for evaluating patients with painful primary total hip arthroplasty (THA). The secondary purpose was a comparison of semi-quantitative and 3D volumetric quantification method for assessment of bone tracer uptake (BTU) in those patients. METHODS: A novel SPECT/CT localization scheme consisting of 14 femoral and 4 acetabular regions on standardized axial and coronal slices was introduced and evaluated in terms of inter- and intra-observer reliability in 37 consecutive patients with hip pain after THA...
May 8, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28472943/semi-automated-brain-tumor-segmentation-on-multi-parametric-mri-using-regularized-non-negative-matrix-factorization
#4
Nicolas Sauwen, Marjan Acou, Diana M Sima, Jelle Veraart, Frederik Maes, Uwe Himmelreich, Eric Achten, Sabine Van Huffel
BACKGROUND: Segmentation of gliomas in multi-parametric (MP-)MR images is challenging due to their heterogeneous nature in terms of size, appearance and location. Manual tumor segmentation is a time-consuming task and clinical practice would benefit from (semi-) automated segmentation of the different tumor compartments. METHODS: We present a semi-automated framework for brain tumor segmentation based on non-negative matrix factorization (NMF) that does not require prior training of the method...
May 4, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28472925/registration-error-of-the-liver-ct-using-deformable-image-registration-of-mim-maestro-and-velocity-ai
#5
Nobuyoshi Fukumitsu, Kazunori Nitta, Toshiyuki Terunuma, Toshiyuki Okumura, Haruko Numajiri, Yoshiko Oshiro, Kayoko Ohnishi, Masashi Mizumoto, Teruhito Aihara, Hitoshi Ishikawa, Koji Tsuboi, Hideyuki Sakurai
BACKGROUND: Understanding the irradiated area and dose correctly is important for the reirradiation of organs that deform after irradiation, such as the liver. We investigated the spatial registration error using the deformable image registration (DIR) software products MIM Maestro (MIM) and Velocity AI (Velocity). METHODS: Image registration of pretreatment computed tomography (CT) and posttreatment CT was performed in 24 patients with liver tumors. All the patients received proton beam therapy, and the follow-up period was 4-14 (median: 10) months...
May 4, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28446130/a-comparison-of-pediatric-and-adult-ct-organ-dose-estimation-methods
#6
Yiming Gao, Brian Quinn, Usman Mahmood, Daniel Long, Yusuf Erdi, Jean St Germain, Neeta Pandit-Taskar, X George Xu, Wesley E Bolch, Lawrence T Dauer
BACKGROUND: Computed Tomography (CT) contributes up to 50% of the medical exposure to the United States population. Children are considered to be at higher risk of developing radiation-induced tumors due to the young age of exposure and increased tissue radiosensitivity. Organ dose estimation is essential for pediatric and adult patient cancer risk assessment. The objective of this study is to validate the VirtualDose software in comparison to currently available software and methods for pediatric and adult CT organ dose estimation...
April 26, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28431519/semi-automatic-synthesis-and-biodistribution-of-n-2-18-f-fluoropropionyl-bis-zinc-ii-dipicolylamine-18-f-fp-dpazn2-for-ad-model-imaging
#7
Fuhua Wen, Dahong Nie, Kongzhen Hu, Ganghua Tang, Shaobo Yao, Caihua Tang
BACKGROUND: Phosphatidylserine (PS)-targeting positron emission tomography (PET) imaging with labeled small-molecule tracer is a crucial non-invasive molecule imaging method of apoptosis. In this study, semi-automatic radiosynthesis and biodistribution of N-(2-(18)F-fluoropropionyl)-bis(zinc(II)-dipicolylamine) ((18)F-FP-DPAZn2), as a potential small-molecule tracer for PET imaging of cell death in Alzheimer's disease (AD) model, were performed. METHODS: (18)F-FP-DPAZn2 was synthesized on the modified PET-MF-2V-IT-I synthesizer...
April 21, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28420325/usefulness-of-grayscale-inverted-images-in-addition-to-standard-images-in-digital-mammography
#8
Ayşegül Altunkeser, M Kazım Körez
BACKGROUND: Mammography is essential for early diagnosis of breast cancer, which is the most common type of cancer in females that is associated with a high mortality rate. We investigated whether evaluation of the grayscale inverted images of mammograms would aid in increasing the diagnostic sensitivity of the mammographic imaging technique. METHODS: Our study included 636 mammograms of 159 women who had undergone digital mammography. Standard, grayscale inverted, and standard plus grayscale inverted images were sequentially examined three times, at 15-day intervals, for the presence or assessment of pathological changes in the skin, calcification, asymmetric density, mass lesions, structural distortions, and intramammary and axillary lymph nodes...
April 18, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28381245/estimation-of-myocardial-deformation-using-correlation-image-velocimetry
#9
Athira Jacob, Ganapathy Krishnamurthi, Manikandan Mathur
BACKGROUND: Tagged Magnetic Resonance (tMR) imaging is a powerful technique for determining cardiovascular abnormalities. One of the reasons for tMR not being used in routine clinical practice is the lack of easy-to-use tools for image analysis and strain mapping. In this paper, we introduce a novel interdisciplinary method based on correlation image velocimetry (CIV) to estimate cardiac deformation and strain maps from tMR images. METHODS: CIV, a cross-correlation based pattern matching algorithm, analyses a pair of images to obtain the displacement field at sub-pixel accuracy with any desired spatial resolution...
April 5, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28302073/image-quality-improvement-using-model-based-iterative-reconstruction-in-low-dose-chest-ct-for-children-with-necrotizing-pneumonia
#10
Jihang Sun, Tong Yu, Jinrong Liu, Xiaomin Duan, Di Hu, Yong Liu, Yun Peng
BACKGROUND: Model-based iterative reconstruction (MBIR) is a promising reconstruction method which could improve CT image quality with low radiation dose. The purpose of this study was to demonstrate the advantage of using MBIR for noise reduction and image quality improvement in low dose chest CT for children with necrotizing pneumonia, over the adaptive statistical iterative reconstruction (ASIR) and conventional filtered back-projection (FBP) technique. METHODS: Twenty-six children with necrotizing pneumonia (aged 2 months to 11 years) who underwent standard of care low dose CT scans were included...
March 16, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28274212/analysis-of-the-three-dimensional-anatomical-variance-of-the-distal-radius-using-3d-shape-models
#11
Sebastian F Baumbach, Jakob Binder, Alexander Synek, Fabian G Mück, Yan Chevalier, Ekkehard Euler, Georg Langs, Lukas Fischer
BACKGROUND: Various medical fields rely on detailed anatomical knowledge of the distal radius. Current studies are limited to two-dimensional analysis and biased by varying measurement locations. The aims were to 1) generate 3D shape models of the distal radius and investigate variations in the 3D shape, 2) generate and assess morphometrics in standardized cut planes, and 3) test the model's classification accuracy. METHODS: The local radiographic database was screened for CT-scans of intact radii...
March 9, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28259149/focused-cardiac-ultrasound-by-unselected-residents-the-challenges
#12
Vidar Ruddox, Ingvild Billehaug Norum, Thomas Muri Stokke, Thor Edvardsen, Jan Erik Otterstad
BACKGROUND: Focus Cardiac Ultrasound (FoCUS) performed by internal medicine residents on call with 2 h of training can provide a means for ruling out cardiac disease, but with poor sensitivity. The purpose of the present study was to evaluate diagnostic usefulness as well as diagnostic accuracy of FoCUS following 4 h of training. METHODS: All residents on call were given a 4-h training course with an additional one-hour training course after 6 months. They were asked to provide a pre- and post-FoCUS diagnosis, with the final diagnosis at discharge as reference...
March 4, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28259145/ultrasonographic-prevalence-and-characteristics-of-non-palpable-thyroid-incidentalomas-in-a-hospital-based-population-in-a-sub-saharan-country
#13
Boniface Moifo, Jean Roger Moulion Tapouh, Sylviane Dongmo Fomekong, François Djomou, Emmanuella Manka'a Wankie
BACKGROUND: Thyroid incidentalomas (TI) are highly prevalent asymptomatic thyroid nodules with ultrasound as the best imaging modality for their detection and characterization. Although they are mostly benign, potential for malignancy is up to 10-15%. In sub-Saharan Africa little data exists on the prevalence and risk categorization of TI. The aim of this study was to determine the prevalence and ultrasound characteristics of non-palpable thyroid incidentalomas among adults in sub-Saharan setting...
March 4, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28249571/evaluating-segmental-liver-function-using-t1-mapping-on-gd-eob-dtpa-enhanced-mri-with-a-3-0-tesla
#14
Zhi-Peng Zhou, Li-Ling Long, Wei-Jia Qiu, Ge Cheng, Li-Juan Huang, Teng-Fei Yang, Zhong-Kui Huang
BACKGROUND: Assessing the liver function provides valuable information to evaluate surgical risk and plan accordingly. Current studies focus on whole liver function evaluation. However, assessment of segmental liver function is equally important in the clinical practice. The purpose of this study was to investigate whether Gd-EOB-DTPA-enhanced MRI can evaluate the liver function of each segment by using T1 mapping at 3 Tesla MRI. METHODS: One hundred three patients were classified into one of 4 groups: a normal liver function (NLF) group (n = 38), a liver cirrhosis with Child-Pugh A (LCA) group (n = 33), a liver cirrhosis with Child-Pugh B (LCB) group (n = 21), and a liver cirrhosis with Child-Pugh C (LCC) group (n = 11)...
March 1, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28241751/time-resolved-tracking-of-the-atrioventricular-plane-displacement-in-cardiovascular-magnetic-resonance-cmr-images
#15
Felicia Seemann, Ulrika Pahlm, Katarina Steding-Ehrenborg, Ellen Ostenfeld, David Erlinge, Jean-Luc Dubois-Rande, Svend Eggert Jensen, Dan Atar, Håkan Arheden, Marcus Carlsson, Einar Heiberg
BACKGROUND: Atrioventricular plane displacement (AVPD) is an indicator for systolic and diastolic function and accounts for 60% of the left ventricular, and 80% of the right ventricular stroke volume. AVPD is commonly measured clinically in echocardiography as mitral and tricuspid annular plane systolic excursion (MAPSE and TAPSE), but has not been applied widely in cardiovascular magnetic resonance (CMR). To date, there is no robust automatic algorithm available that allows the AVPD to be measured clinically in CMR with input in a single timeframe...
February 28, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28241752/distal-radius-plate-of-cfr-peek-has-minimal-effect-compared-to-titanium-plates-on-bone-parameters-in-high-resolution-peripheral-quantitative-computed-tomography-a-pilot-study
#16
Joost J A de Jong, Arno Lataster, Bert van Rietbergen, Jacobus J Arts, Piet P Geusens, Joop P W van den Bergh, Paul C Willems
BACKGROUND: Carbon-fiber-reinforced poly-ether-ether-ketone (CFR-PEEK) has superior radiolucency compared to other orthopedic implant materials, e.g. titanium or stainless steel, thus allowing metal-artifact-free postoperative monitoring by computed tomography (CT). Recently, high-resolution peripheral quantitative CT (HRpQCT) proved to be a promising technique to monitor the recovery of volumetric bone mineral density (vBMD), micro-architecture and biomechanical parameters in stable conservatively treated distal radius fractures...
February 27, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28219332/the-assessment-of-accessory-mental-foramen-in-a-selected-polish-population-a-cbct-study
#17
Ewa Zmysłowska-Polakowska, Mateusz Radwański, Michał Łęski, Sławomir Ledzion, Monika Łukomska-Szymańska, Michał Polguj
BACKGROUND: Accessory mental foramen (AMF) is a rare anatomical variation. When accessory mental foramen is present, the nerves and vessels that go through the mental foramen (MF) must follow alternative courses and special care must be taken during dental treatment planning. The purpose of this study was to evaluate the occurrence and the location of AMF in a selected Polish population using cone-beam computed tomography (CBCT). METHODS: Two hundred CBCT (105 males and 95 females) examinations were evaluated for the presence of AMFs...
February 20, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28196476/automatic-mri-segmentation-of-para-pharyngeal-fat-pads-using-interactive-visual-feature-space-analysis-for-classification
#18
Muhammad Laiq Ur Rahman Shahid, Teodora Chitiboi, Tetyana Ivanovska, Vladimir Molchanov, Henry Völzke, Lars Linsen
BACKGROUND: Obstructive sleep apnea (OSA) is a public health problem. Detailed analysis of the para-pharyngeal fat pads can help us to understand the pathogenesis of OSA and may mediate the intervention of this sleeping disorder. A reliable and automatic para-pharyngeal fat pads segmentation technique plays a vital role in investigating larger data bases to identify the anatomic risk factors for the OSA. METHODS: Our research aims to develop a context-based automatic segmentation algorithm to delineate the fat pads from magnetic resonance images in a population-based study...
February 14, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28196474/biodegradable-magnesium-herbert-screw-image-quality-and-artifacts-with-radiography-ct-and-mri
#19
Lena Sonnow, Sören Könneker, Peter M Vogt, Frank Wacker, Christian von Falck
BACKGROUND: Magnesium alloys have recently been rediscovered as biodegradable implants in musculoskeletal surgery. This study is an ex-vivo trial to evaluate the imaging characteristics of magnesium implants in different imaging modalities as compared to conventional metallic implants. METHODS: A CE-approved magnesium Herbert screw (MAGNEZIX®) and a titanium screw of the same dimensions (3.2x20 mm) were imaged using different modalities: digital radiography (DX), multidetector computed tomography (MDCT), high resolution flat panel CT (FPCT) and magnetic resonance imaging (MRI)...
February 14, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28193267/abdominal-ultrasound-scanning-versus-non-contrast-computed-tomography-as-screening-method-for-abdominal-aortic-aneurysm-a-validation-study-from-the-randomized-dancavas-study
#20
Mads Liisberg, Axel C Diederichsen, Jes S Lindholt
BACKGROUND: Validating non-contrast-enhanced computed tomography (nCT) compared to ultrasound sonography (US) as screening method for abdominal aortic aneurysm (AAA) screening. METHODS: Consecutively attending men (n = 566) from the pilot study of the randomized Danish CardioVascular Screening trial (DANCAVAS trial), underwent nCT and US examination. Diameters were measured in outer-to-outer fashion. Sensitivity and specificity were done testing each modality against each other as reference standard...
February 14, 2017: BMC Medical Imaging
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