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BMC Medical Imaging

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https://www.readbyqxmd.com/read/28814282/alterations-in-resting-state-functional-connectivity-of-the-default-mode-network-in-amnestic-mild-cognitive-impairment-an-fmri-study
#1
Moyi Li, Guohua Zheng, Yuhui Zheng, Zhenyu Xiong, Rui Xia, Wenji Zhou, Qin Wang, Shengxiang Liang, Jing Tao, Lidian Chen
BACKGROUND: Amnestic mild cognitive impairment (aMCI) is characterized by cognitive functional decline, especially in memory. Resting-state functional magnetic resonance imaging (fMRI) has been widely used in neuroimaging studies that explore alterations between patients and normal individuals to elucidate the pathological mechanisms of different diseases. The current study was performed to investigate alterations in the functional connectivity of the default mode network (DMN) in aMCI patients compared to healthy elderly controls, as well as further define the association between neurological alterations and memory function...
August 16, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28764643/detection-of-articular-perforations-of-the-proximal-humerus-fracture-using-a-mobile-3d-image-intensifier-a-cadaver-study
#2
Jan Theopold, Kevin Weihs, Christine Feja, Bastian Marquaß, Christoph Josten, Pierre Hepp
BACKGROUND: The purpose of this study was to investigate the accuracy of perforation detection with multiplanar reconstructions using a mobile 3D image intensifier. METHODS: In 12 paired human humeri, K-wires perforating the subchondral bone and placed just below the cartilage level were directed toward five specific regions in the humeral head. Image acquisition was initiated by a fluoroscopy scan. Within a range of 90°, 45° external rotation (ER) and 45° internal rotation (IR)...
August 1, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28738834/the-value-of-99m-tc-methylene-diphosphonate-single-photon-emission-computed-tomography-computed-tomography-in-diagnosis-of-fibrous-dysplasia
#3
Linqi Zhang, Qiao He, Wei Li, Rusen Zhang
BACKGROUND: Fibrous dysplasia (FD) is a rare benign bone disorder in which the normal bone is replaced by immature fibro-osseous tissue. However, some case reports have reported that FD showed significantly increased (99m)Tc-methylene diphosphonate ((99m)Tc-MDP) uptake on whole-body bone scintigraphy (WBS), which may mimic bone metastasis or skeletal involvement of the patients with known cancer. Thus, the purpose of present study is to observe the reliable characteristics and usefulness of single photon emission computed tomography/computed tomography (SPECT/CT) for the diagnosis of FD...
July 24, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28738798/efficacy-of-sellar-opening-in-the-pituitary-adenoma-resection-of-transsphenoidal-surgery-influences-the-degree-of-tumor-resection
#4
Shousen Wang, Yong Qin, Deyong Xiao, Liangfeng Wei
BACKGROUND: Endonasal transsphenoidal microsurgery is often adopted in the resection of pituitary adenoma, and has showed satisfactory treatment and minor injuries. It is important to accurately localize sellar floor and properly incise the bone and dura matter. METHODS: Fifty-one patients with pituitary adenoma undergoing endonasal transsphenoidal microsurgery were included in the present study. To identify the scope of sellar floor opening, CT scan of the paranasal sinus and MRI scan of the pituitary gland were performed for each subject...
July 24, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28732493/evaluation-of-left-atrial-volume-and-function-using-single-beat-real-time-three-dimensional-echocardiography-in-atrial-fibrillation-patients
#5
Qian Zhang, Ju-Fang Wang, Qing-Qing Dong, Qing Yan, Xiang-Hong Luo, Xue-Ying Wu, Jian Liu, Ya-Ping Sun
BACKGROUND: This study was aimed to evaluate the feasibility and accuracy of real-time three-dimensional echocardiography (RT-3DE) measurement of left atrial (LA) volume and function in comparison with two-dimensional echocardiography (2DE) measurements in atrial fibrillation (AF) patients. METHODS: A total of 50 pairs of AF patients and healthy controls were enrolled in this study. Indexed LA end-diastole volume (ILAEDV) and indexed LA end-systolic volume (ILAESV), as well as LA function indices such as segmental LA ejection fraction (LAEF), were assessed using 2DE Simpson's method and the RT-3DE method...
July 21, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28724406/iodine-concentration-calculated-by-dual-energy-computed-tomography-dect-as-a-functional-parameter-to-evaluate-thyroid-metabolism-in-patients-with-hyperthyroidism
#6
Duong Duc Binh, Takahito Nakajima, Hidenori Otake, Tetsuya Higuchi, Yoshito Tsushima
BACKGROUND: Thyroid function in patients with Grave's disease is usually evaluated by thyroid scintigraphy with radioactive iodine. Recently, dual-energy computed tomography (DECT) with two different energy X-rays can calculate iodine concentrations and can be applied for iodine measurements in thyroid glands. This study aimed to assess the potential use of DECT for the functional assessment of the thyroid gland. METHODS: Thirteen patients with Grave's disease treated at our hospital from May to September 2015 were included in this retrospective study...
July 19, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28705145/texture-based-classification-of-different-single-liver-lesion-based-on-spair-t2w-mri-images
#7
Zhenjiang Li, Yu Mao, Wei Huang, Hongsheng Li, Jian Zhu, Wanhu Li, Baosheng Li
BACKGROUND: To assess the feasibility of texture analysis (TA) based on spectral attenuated inversion-recovery T2 weighted magnetic resonance imaging (SPAIR T2W-MRI) for the classification of hepatic hemangioma (HH), hepatic metastases (HM) and hepatocellular carcinoma (HCC). METHODS: The SPAIR T2W-MRI data of 162 patients with HH (n=55), HM (n=67) and HCC (n=40) were retrospectively analyzed. We used two independent cohorts for training (n = 112 patients) and validation (n = 50 patients)...
July 13, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28693444/the-value-of-ultrasound-guided-biopsy-of-fluorodeoxy-glucose-positron-emission-tomography-fdg-pet-positive-supraclavicular-lymph-nodes-in-patients-with-suspected-lung-cancer
#8
Lennart Werner, Franziska Aebersold Keller, Ujwal Bhure, Justus Egidius Roos, Katharina Tornquist, Maria Del Sol Pèrez-Lago, Oliver Gautschi, Klaus Strobel
BACKGROUND: Accurate lymph node staging is essential for adequate prognostication and therapy planning in patients with non-small cell lung cancer (NSCLC). FDG-PET/CT is a sensitive tool for the detection of metastases, including non-palpable supraclavicular lymph node (SCLN) metastases. Histological proof of metastatic spread and mutation analysis is crucial for optimal staging and therapy. The aim of this study was to investigate the value of ultrasound-guided fine needle aspiration cytology (FNAC) and core biopsy (CB) of FDG active, non-palpable SCLN's in patients with suspicion for lung cancer...
July 11, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28693433/prospective-evaluation-of-computer-assisted-analysis-of-skeletal-lesions-for-the-staging-of-prostate-cancer
#9
Lars J Petersen, Jesper C Mortensen, Henrik Bertelsen, Helle D Zacho
BACKGROUND: The purpose of this study was to compare the agreement of the bone scan index (BSI) using EXINI Bone(BSI) versus experts' readings in the initial staging for bone metastasis in prostate cancer. In addition, the diagnostic outcome was assessed in a large subset of patients where a true reference for metastases could be determined based on clinical and biochemical follow-up and/or supplementary imaging. METHODS: A total of 342 patients had a bone scintigraphy as part of routine staging for prostate cancer...
July 10, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28683719/microbubbles-in-macrocysts-contrast-enhanced-ultrasound-assisted-sclerosant-therapy-of-a-congenital-macrocystic-lymphangioma-a-case-report
#10
Carlos Menendez-Castro, Maren Zapke, Fabian Fahlbusch, Heiko von Goessel, Wolfgang Rascher, Jörg Jüngert
BACKGROUND: Congenital cystic lymphangiomas are benign malformations due to a developmental disorder of lymphatic vessels. Besides surgical excision, sclerosant therapy of these lesions by intracavitary injection of OK-432 (Picibanil®), a lyophilized mixture of group A Streptococcus pyogenes, is a common therapeutical option. For an appropriate application of OK-432, a detailed knowledge about the structure and composition of the congenital cystic lymphangioma is essential. SonoVue® is a commercially available contrast agent commonly used in sonography by intravenous and intracavitary application...
July 6, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28629416/ct-texture-features-are-associated-with-overall-survival-in-pancreatic-ductal-adenocarcinoma-a-quantitative-analysis
#11
Armin Eilaghi, Sameer Baig, Yucheng Zhang, Junjie Zhang, Paul Karanicolas, Steven Gallinger, Farzad Khalvati, Masoom A Haider
BACKGROUND: To assess whether CT-derived texture features predict survival in patients undergoing resection for pancreatic ductal adenocarcinoma (PDAC). METHODS: Thirty patients with pre-operative CT from 2007 to 2012 for PDAC were included. Tumor size and five texture features namely uniformity, entropy, dissimilarity, correlation, and inverse difference normalized were calculated. Mann-Whitney rank sum test was used to compare tumor with normal pancreas. Receiver operating characteristics (ROC) analysis, Cox regression and Kaplan-Meier tests were used to assess association of texture features with overall survival (OS)...
June 19, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28610610/atypical-findings-of-perineural-cysts-on-postmyelographic-computed-tomography-a-case-report-of-intermittent-intercostal-neuralgia-caused-by-thoracic-perineural-cysts
#12
Hirokazu Iwamuro, Taro Yanagawa, Sachiko Takamizawa, Makoto Taniguchi
BACKGROUND: Perineural cysts are sometimes found incidentally with magnetic resonance imaging, and clinical symptoms requiring treatment are rare. Perineural cysts typically exhibit delayed filling with contrast medium on myelography, which is one of the criteria used by Tarlov to distinguish perineural cysts from meningeal diverticula. We present a case of multiple thoracolumbar perineural cysts, one of which was considered the cause of intermittent intercostal neuralgia with atypical findings on postmyelographic computed tomography seen as selective filling of contrast medium...
June 13, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28549448/statistical-permutation-based-artery-mapping-spam-a-novel-approach-to-evaluate-imaging-signals-in-the-vessel-wall
#13
Robert Seifert, Aaron Scherzinger, Friedemann Kiefer, Sven Hermann, Xiaoyi Jiang, Michael A Schäfers
BACKGROUND: Cardiovascular diseases are the leading cause of death worldwide. A prominent cause of cardiovascular events is atherosclerosis, a chronic inflammation of the arterial wall that leads to the formation of so called atherosclerotic plaques. There is a strong clinical need to develop new, non-invasive vascular imaging techniques in order to identify high-risk plaques, which might escape detection using conventional methods based on the assessment of the luminal narrowing. In this context, molecular imaging strategies based on fluorescent tracers and fluorescence reflectance imaging (FRI) seem well suited to assess molecular and cellular activity...
May 26, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28545408/importance-of-correctly-interpreting-magnetic-resonance-imaging-to-diagnose-posterior-reversible-encephalopathy-syndrome-associated-with-hellp-syndrome-a-case-report
#14
Syuichi Tetsuka, Hiroaki Nonaka
BACKGROUND: Severe haemolysis, elevated liver enzyme levels, and low platelet count (HELLP) syndrome in pregnancy are possible underlying trigger factors for posterior reversible encephalopathy syndrome (PRES). Magnetic resonance imaging (MRI) shows diffuse signal abnormalities involving the subcortical white matter in the parieto-occipital lobes. Although the diagnosis of RPES was clearly established by the distinctive reversibility of clinical and radiological abnormalities, it is difficult to distinguish from differential diagnosis...
May 25, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28545406/deterministic-compressive-sampling-for-high-quality-image-reconstruction-of-ultrasound-tomography
#15
Tran Quang Huy, Huynh Huu Tue, Ton That Long, Tran Duc-Tan
BACKGROUND: A well-known diagnostic imaging modality, termed ultrasound tomography, was quickly developed for the detection of very small tumors whose sizes are smaller than the wavelength of the incident pressure wave without ionizing radiation, compared to the current gold-standard X-ray mammography. Based on inverse scattering technique, ultrasound tomography uses some material properties such as sound contrast or attenuation to detect small targets. The Distorted Born Iterative Method (DBIM) based on first-order Born approximation is an efficient diffraction tomography approach...
May 25, 2017: BMC Medical Imaging
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
#16
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
#17
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
#18
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
#19
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
#20
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
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