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Acta Radiologica

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https://www.readbyqxmd.com/read/28090794/novel-sluggish-speed-signs-on-ultrasound-is-indicative-of-hemangiomas
#1
Taisuke Furuta, Shoji Shimose, Yuko Nakashima, Tadahiko Kubo, Mitsuo Ochi
Background Hemangiomas are sometimes difficult to diagnose with current techniques. Sluggish speed signs (SSS) are a phenomenon that: (i) cannot be depicted as Doppler flow on Doppler ultrasound; (ii) can be observed as fluid movements on Doppler ultrasound; and (iii) cannot be depicted as waveforms on pulse Doppler mode. We hypothesized that SSS could be diagnostic indicators for hemangiomas. Purpose To evaluate whether ultrasound findings, in particular those relating to SSS, are a reliable tool for detecting hemangiomas compared to magnetic resonance imaging (MRI) and the gold standard for hemangioma diagnosis: pathological examination by biopsy or after surgical resection...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28090793/development-and-validation-of-a-predictor-of-insufficient-enhancement-during-the-hepatobiliary-phase-of-gd-eob-dtpa-enhanced-magnetic-resonance-imaging
#2
Enming Cui, Wansheng Long, Liangping Luo, Maoqing Hu, Liebin Huang, Xiangmeng Chen
Background Insufficient enhancement of liver parenchyma negatively affects diagnostic accuracy of Gd-EOB-DTPA-enhanced magnetic resonance imaging (MRI). Currently, there is no reliable method for predicting insufficient enhancement during the hepatobiliary phase (HBP) in Gd-EOB-DTPA-enhanced MRI. Purpose To develop a predictor for insufficient enhancement of liver parenchyma during HBP in Gd-EOB-DTPA-enhanced MRI. Material and Methods In order to formulate a HBP enhancement test (HBP-ET), clinical factors associated with relative enhancement ratio (RER) of liver parenchyma were retrospectively determined from the datasets of 156 patients (Development group) who underwent Gd-EOB-DTPA-enhanced MRI between November 2012 and May 2015...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28090792/cerebral-schistosomiasis-diffusion-weighted-imaging-helps-to-differentiate-from-brain-glioma-and-metastasis
#3
Jinbai Huang, Jing Luo, Jie Peng, Tao Yang, Huanghua Zheng, Chunping Mao
Background Diffusion-weighted imaging (DWI) was introduced into clinical use some years ago. However, its use in the diagnosis of cerebral schistosomiasis has not been reported. Purpose To investigate the ability of the apparent diffusion coefficient (ADC) value of DWI in the diagnosis of cerebral schistosomiasis, and to differentiate it from brain high-grade gliomas and metastasis. Material and Methods Conventional brain MRI with pre-contrast, post-contrast, and DWI was performed on 50 cases of cerebral schistosomiasis, high-grade glioma, and brain metastasis...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28090791/additive-value-of-otosclerosis-weighted-images-for-the-ct-diagnosis-of-fenestral-otosclerosis
#4
Koji Yamashita, Akio Hiwatashi, Osamu Togao, Masatoshi Kondo, Kazufumi Kikuchi, Takashi Inoguchi, Junki Maehara, Yusuke Kyuragi, Hiroshi Honda
Background Otosclerotic foci are usually seen as minute low-density lesions and this may be attributed to relatively low sensitivity on visual assessment using computed tomography (CT). Otosclerotic foci can be detected by using the accurate region of interest (ROI) setting, while small ROI settings by less-experienced radiologists may result in false negative findings. Purpose To evaluate the diagnostic ability of our proposed method ("otosclerosis-weighted" imaging [OWI]), which is based on reversing the density, compared with conventional CT (CCT) imaging alone...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28084815/diagnostic-accuracy-of-diffusion-restriction-in-intraductal-papillary-mucinous-neoplasm-of-the-pancreas-in-comparison-with-high-risk-stigmata-of-the-2012-international-consensus-guidelines-for-prediction-of-the-malignancy-and-invasiveness
#5
Mimi Kim, Kyung Mi Jang, Seong Hyun Kim, Kyoung Doo Song, Woo Kyoung Jeong, Tae Wook Kang, Young Kon Kim, Dong Ik Cha, Kyunga Kim, Heejin Yoo
Background It is debated whether diagnostic performance of diffusion-weighted imaging (DWI), which is widely used for detection and characterization of various malignant tumors, is comparable with high-risk stigmata of 2012 international consensus guidelines (ICG) for diagnosis of intraductal papillary mucinous neoplasms (IPMNs). Purpose To evaluate the diagnostic accuracy of diffusion restriction in IPMNs for prediction of malignancy and invasiveness in comparison with high-risk stigmata of 2012 ICG. Material and Methods This retrospective study was institutional review board approved and informed consent was waived...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28084814/feasibility-of-low-dose-digital-pulsed-video-fluoroscopic-swallow-exams-vfse-effects-on-radiation-dose-and-image-quality
#6
Jakob Weiss, Mike Notohamiprodjo, Klement Neumaier, Minglun Li, Wilhelm Flatz, Konstantin Nikolaou, Andreas Pomschar
Background Fluoroscopy is a frequently used examination in clinical routine without appropriate research evaluation latest hardware and software equipment. Purpose To evaluate the feasibility of low-dose pulsed video-fluoroscopic swallowing exams (pVFSE) to reduce dose exposure in patients with swallowing disorders compared to high-resolution radiograph examinations (hrVFSE) serving as standard of reference. Material and Methods A phantom study (Alderson-Rando Phantom, 60 thermoluminescent dosimeters [TLD]) was performed for dose measurements...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28084813/mri-diagnosis-of-carpal-boss-and-comparison-with-radiography
#7
Marc Mespreuve, Luc De Smet, Kristof De Cuyper, Karl Waked, Filip Vanhoenacker
Background A carpal boss is a potentially painful bony mass in the region of the second or third carpometacarpal joint. The combination of clinical examination and radiography is usually sufficient for the diagnosis. Purpose To determine whether magnetic resonance imaging (MRI) examination of the quadrangular joint can assist the diagnosis of persistent pain near a carpal boss. Material and Methods Fifty-seven patients with a carpal boss were retrospectively reviewed using MRI and conventional radiographs and compared to an asymptomatic control group...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28084812/impact-of-transjugular-intrahepatic-portosystemic-shunt-implantation-on-liver-perfusion-measured-by-volume-perfusion-ct
#8
Heike Preibsch, Daniel Spira, Wolfgang M Thaiss, Roland Syha, Konstantin Nikolaou, Dominik Ketelsen, Ulrich M Lauer, Marius Horger
Background Implantation of a transjugular intrahepatic portosystemic shunt (TIPS) induces changes of liver perfusion. Purpose To determine the changes in arterial, portal venous, and total perfusion of the liver parenchyma induced by TIPS using the technique of volume perfusion computed tomography (VPCT) and compare results with invasively measured hepatic intravascular pressure values. Material and Methods VPCT quantification of liver perfusion was performed in 23 patients (mean age, 62.5 ± 8.8 years) with portal hypertension in the pre-TIPS and post-TIPS setting, respectively...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28084811/power-doppler-signal-calibration-in-the-finger-joint-between-two-models-of-ultrasound-machine-a-pilot-study-using-a-phantom-and-joints-in-patients-with-rheumatoid-arthritis
#9
Ryosuke Sakano, Katsumi Saito, Tamotsu Kamishima, Mutsumi Nishida, Tatsunori Horie, Atsushi Noguchi, Michihito Kono, Kenneth Sutherland, Tatsuya Atsumi
Background Despite the advantages of ultrasound (US) in the management of rheumatoid arthritis (RA) patients, power Doppler (PD) US may be highly dependent on the type of US machine used. Purpose To present a method to calibrate the PD signal of two models of US machines by use of a flow phantom and finger joints of patients with RA. Material and Methods For the phantom study, the PD signal count was measured in the flow phantom perfusing blood mimicking fluid at various injection rates and pulse repetition frequencies (PRFs)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28084810/fluoroscopic-guided-stent-placement-in-failed-tentative-endoscopic-approaches-to-malignant-gastroduodenal-obstructions
#10
Soo Hwan Kim, Ho-Young Song, Jung-Hoon Park, Wei-Zhong Zhou, Young Chul Cho, Ji Hoon Shin, Jin Hyoung Kim
Background Fluoroscopic or endoscopic placement of metallic stents is used as a safe, non-surgical, palliative treatment option for malignant gastroduodenal obstructions. However, endoscopic stent placement is not always feasible, due to the tight or tortuous stricture of the obstructed area and insufficient visualization of the stomach due to remnant food material. Purpose To assess the technical feasibility and clinical outcomes of fluoroscopic-guided stent placement in malignant gastroduodenal obstructions following the technical failure of endoscopic stent placement...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28068825/microdose-acquisition-in-adolescent-leg-length-discrepancy-using-a-low-dose-biplane-imaging-system
#11
Janni Jensen, Bo R Mussmann, John Hjarbæk, Zaid Al-Aubaidi, Niels W Pedersen, Oke Gerke, Trine Torfing
Background Children with leg length discrepancy often undergo repeat imaging. Therefore, every effort to reduce radiation dose is important. Using low dose preview images and noise reduction software rather than diagnostic images for length measurements might contribute to reducing dose. Purpose To compare leg length measurements performed on diagnostic images and low dose preview images both acquired using a low-dose bi-planar imaging system. Material and Methods Preview and diagnostic images from 22 patients were retrospectively collected (14 girls, 8 boys; mean age, 12...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28068824/three-dimensional-power-doppler-ultrasound-in-the-early-assessment-of-response-to-concurrent-chemo-radiotherapy-for-advanced-cervical-cancer
#12
Yan Xu, Lijing Zhu, Tong Ru, Huanhuan Wang, Jian He, Zhengyang Zhou, Xiaofeng Yang
Background Three-dimensional power Doppler ultrasound (3D-PDU) imaging has been widely applied to the differentiation of benign and malignant cervical lesions; however, its potential value for predicting response to chemo-radiotherapy has not been fully explored. Purpose To investigate the feasibility of 3D-PDU imaging in predicting treatment response in patients receiving concurrent chemo-radiotherapy (CCRT) for advanced cervical cancer. Material and Methods Fifty-two patients with advanced cervical cancer who received CCRT underwent 3D-PDU examinations at four timepoints: pre-therapy (baseline), 1 week and 2 weeks during, as well as immediately post CCRT...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28068823/leg-lengthening-and-femoral-offset-reduction-after-total-hip-arthroplasty-where-is-the-problem-stem-or-cup-positioning
#13
Bariq Al-Amiry, Sarwar Mahmood, Ferid Krupic, Arkan Sayed-Noor
Background Restoration of femoral offset (FO) and leg length is an important goal in total hip arthroplasty (THA) as it improves functional outcome. Purpose To analyze whether the problem of postoperative leg lengthening and FO reduction is related to the femoral stem or acetabular cup positioning or both. Material and Methods Between September 2010 and April 2013, 172 patients with unilateral primary osteoarthritis treated with THA were included. Postoperative leg-length discrepancy (LLD) and global FO (summation of cup and FO) were measured by two observers using a standardized protocol for evaluation of antero-posterior plain hip radiographs...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/27956463/internal-comparison-standard-for-abdominal-diffusion-weighted-imaging
#14
Zafer Koc, Gurcan Erbay, Elif Karadeli
BACKGROUND: Standards for abdominal diffusion-weighted imaging (DWI), apparent diffusion coefficient (ADC) measurements, and analysis are required for reproducibility. PURPOSE: To identify optimal internal comparison standards for DWI to normalize the measured ADC for increased accuracy of differentiating malignant and benign abdominal lesions. MATERIAL AND METHODS: We retrospectively studied 97 lesions (89 patients; age, 57 ± 13 years) with histopathologically confirmed abdominal disease...
December 12, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27956462/evaluation-of-neovascularization-patterns-in-an-orthotopic-rat-glioma-model-with-dynamic-contrast-enhanced-mri
#15
Du Xuesong, Xue Wei, Liu Heng, Chen Xiao, Wang Shunan, Guo Yu, Zhang Weiguo
BACKGROUND: Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) has been proved useful in evaluating glioma angiogenesis, but the utility in evaluating neovascularization patterns has not been reported. PURPOSE: To evaluate in vivo real-time glioma neovascularization patterns by measuring glioma perfusion quantitatively using DCE-MRI. MATERIAL AND METHODS: Thirty Sprague-Dawley rats were used to establish C6 orthotopic glioma model and underwent MRI and pathology detections...
December 12, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27903759/intrahepatic-distant-recurrence-after-radiofrequency-ablation-for-hepatocellular-carcinoma-precursor-nodules-on-pre-procedural-gadoxetic-acid-enhanced-liver-magnetic-resonance-imaging
#16
Kyoung Doo Song, Hyunchul Rhim, Min Woo Lee, Young-Sun Kim, Tae Wook Kang
BACKGROUND: Intrahepatic distant recurrence (IDR) after radiofrequency (RF) ablation for hepatocellular carcinoma (HCC) is associated with poor overall survival outcome. PURPOSE: To evaluate the incidence and findings on pre-procedural gadoxetic acid-enhanced liver magnetic resonance imaging (MRI) of precursor nodules for IDR after RF ablation for HCC. MATERIAL AND METHODS: This study was approved by our institutional review board. Among 343 patients treated with RF ablation for HCC between 2009 and 2011, 141 patients who underwent pre-procedural gadoxetic acid-enhanced liver MRI and experienced IDR were enrolled...
November 30, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27879399/bone-subtraction-radiography-in-adult-patients-with-cystic-fibrosis
#17
Verena C Obmann, Andreas Christe, Lukas Ebner, Zsolt Szucs-Farkas, Sebastian R Ott, Sai Yarram, Enno Stranzinger
BACKGROUND: Bone subtraction radiography allows reading pulmonary changes of chest radiographs more accurately without superimposition of bones. PURPOSE: To evaluate the value of bone subtraction chest radiography using dual energy (DE) bone subtracted lung images compared to conventional radiographs (CR) in adult patients with cystic fibrosis (CF). MATERIAL AND METHODS: Forty-nine DE radiographs of 24 patients (16 men) with CF (mean age, 32 years; age range, 18-71 years) were included...
November 22, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27872352/additional-functional-outcomes-after-endovascular-treatment-for-intermittent-claudication
#18
Anne Sofie F Larsen, Morten B Jacobsen, Jarlis Wesche, Nils Einar Kløw
BACKGROUND: Endovascular treatment (EVT) for intermittent claudication (IC) is performed in selected patients where conservative treatment and training fail. Treatment outcomes reported in vascular registries (survival, limb-survival, and re-intervention rate) are inadequate for low-risk patients with IC. Additional measurements of blood flow reduction and functional impairment clarify the indication for treatment and facilitate outcome evaluation. PURPOSE: To analyze the additional outcome information on peripheral arterial pressures and walking capacity obtained from a local registry of EVT...
November 21, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27872351/uterine-fibroid-embolization-with-acrylamido-polyvinyl-microspheres-prospective-12-month-clinical-and-mri-follow-up-study
#19
Stevo Duvnjak, Pernille Ravn, Anders Green, Poul Erik Andersen
BACKGROUND: Uterine fibroid embolization (UFE) is an effective minimally invasive treatment aimed to obtain complete fibroid infarction. PURPOSE: To evaluate the degree of fibroid infarction after embolization with acrylamido polyvinyl alcohol microspheres (Bead Block). MATERIAL AND METHODS: This prospective study included 26 pre-menopausal women in the period October 2013 to January 2015. UFE with the use of Bead Block microspheres 700-900 µm was obtained until flow stasis was achieved...
November 21, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27872350/simultaneous-acquisition-of-high-contrast-and-quantitative-liver-t1-images-using-3d-phase-sensitive-inversion-recovery-a-feasibility-study
#20
Yasuhiro Fujiwara, Hirotoshi Maruyama, Nobuyuki Kosaka, Yoshiyuki Ishimori
BACKGROUND: Tumor-to-liver contrast is low in images of chronically diseased livers because gadolinium-based hepatocyte-specific contrast agents (Gd-EOB-DTPA) accumulate less to hepatocytes. PURPOSE: To determine whether phase-sensitive inversion recovery (PSIR) could improve the T1 contrasts of Gd-based contrast agents and liver parenchyma and simultaneously provide accurate T1 values for abdominal organs. MATERIAL AND METHODS: The image contrasts of phantoms with different Gd concentrations that were obtained using PSIR were compared to conventional turbo field echo (TFE) results...
November 21, 2016: Acta Radiologica
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