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Radiology

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https://www.readbyqxmd.com/read/28520513/rectal-mucinous-adenocarcinoma-mr-imaging-assessment-of-response-to-concurrent-chemotherapy-and-radiation-therapy-a-hypothesis-generating-study
#1
Seung Hyun Park, Joon Seok Lim, Jinae Lee, Ha Yan Kim, Woong Sub Koom, Hyuk Hur, Mi-Suk Park, Myeong-Jin Kim, Honsoul Kim
Purpose To develop a system for assessment of tumor regression grade (TRG) with magnetic resonance (MR) imaging that is applicable to rectal mucinous adenocarcinoma (RMAC) and to obtain a preliminary evaluation of the association of MR imaging assessment of TRG with response to preoperative concurrent chemotherapy and radiation therapy (CCRT). Materials and Methods This retrospective study was approved by the institutional review board, and informed consent was waived. Pre- and post-CCRT MR images of 59 patients with RMAC (median age, 59 years; range, 29-80 years; 42 men [median age, 59 years; range, 36-80 years] and 17 women [median age, 57 years; range, 29-79 years]) who underwent CCRT and subsequent elective resection from July 2005 to June 2015 were analyzed...
May 18, 2017: Radiology
https://www.readbyqxmd.com/read/28514203/cost-effectiveness-of-mr-imaging-guided-strategies-for-detection-of-prostate-cancer-in-biopsy-naive-men
#2
Shivani Pahwa, Nicholas K Schiltz, Lee E Ponsky, Ziang Lu, Mark A Griswold, Vikas Gulani
Purpose To evaluate the cost-effectiveness of multiparametric diagnostic magnetic resonance (MR) imaging examination followed by MR imaging-guided biopsy strategies in the detection of prostate cancer in biopsy-naive men presenting with clinical suspicion of cancer for the first time. Materials and Methods A decision-analysis model was created for biopsy-naive men who had been recommended for prostate biopsy on the basis of abnormal digital rectal examination results or elevated prostate-specific antigen levels (age groups: 41-50 years, 51-60 years, and 61-70 years)...
May 17, 2017: Radiology
https://www.readbyqxmd.com/read/28510483/improvement-in-ventilation-perfusion-mismatch-after-bronchoscopic-lung-volume-reduction-quantitative-image-analysis
#3
Sei Won Lee, Sang Min Lee, So Youn Shin, Tai Sun Park, Sang Young Oh, Namkug Kim, Yoonki Hong, Jae Seung Lee, Yeon-Mok Oh, Sang-Do Lee, Joon Beom Seo
Purpose To evaluate whether bronchoscopic lung volume reduction (BLVR) increases ventilation and therefore improves ventilation-perfusion (V/Q) mismatch. Materials and Methods All patients provided written informed consent to be included in this study, which was approved by the Institutional Review Board (2013-0368) of Asan Medical Center. The physiologic changes that occurred after BLVR were measured by using xenon-enhanced ventilation and iodine-enhanced perfusion dual-energy computed tomography (CT). Patients with severe emphysema plus hyperinflation who did not respond to usual treatments were eligible...
May 16, 2017: Radiology
https://www.readbyqxmd.com/read/28498793/catheter-directed-intraportal-delivery-of-endothelial-cell-therapy-for-liver-regeneration-a-feasibility-study-in-a-large-animal-model-of-cirrhosis
#4
Kyungmouk Steve Lee, Sara F Santagostino, David Li, Amit Ramjit, Kenneth Serrano, Michael D Ginsberg, Bi-Sen Ding, Shahin Rafii, David C Madoff
Purpose To demonstrate the feasibility of imaging-guided catheter-directed delivery of endothelial cell therapy in a porcine model of cirrhosis for liver regeneration. Materials and Methods After approval from the institutional animal care and use committee, autologous liver endothelial cells were grown from core hepatic specimens from swine. Cirrhosis was induced in swine by means of transcatheter infusion of ethanol and iodized oil into the hepatic artery. Three weeks after induction of cirrhosis, the swine were randomly assigned to receive autologous cell therapy (endothelial cells, n = 4) or control treatment (phosphate-buffered saline, n = 4) by means of imaging-guided transhepatic intraportal catheterization...
May 11, 2017: Radiology
https://www.readbyqxmd.com/read/28498794/diagnosis-of-normal-pressure-hydrocephalus-use-of-traditional-measures-in-the-era-of-volumetric-mr-imaging
#5
Nityanand Miskin, Hersh Patel, Ana M Franceschi, Benjamin Ades-Aron, Alexander Le, Brianna E Damadian, Christian Stanton, Yafell Serulle, James Golomb, Oded Gonen, Henry Rusinek, Ajax E George
Purpose To assess the diagnostic performance of the callosal angle (CA) and Evans index (EI) measures and to determine their role versus automated volumetric methods in clinical radiology. Materials and Methods Magnetic resonance (MR) examinations performed before surgery (within 1-5 months of the MR examination) in 36 shunt-responsive patients with normal-pressure hydrocephalus (NPH; mean age, 75 years; age range, 58-87 years; 26 men, 10 women) and MR examinations of age- and sex-matched patients with Alzheimer disease (n = 34) and healthy control volunteers (n = 36) were studied...
May 10, 2017: Radiology
https://www.readbyqxmd.com/read/28493790/endometrial-carcinoma-mr-imaging-based-texture-model-for-preoperative-risk-stratification-a-preliminary-analysis
#6
Yoshiko Ueno, Behzad Forghani, Reza Forghani, Anthony Dohan, Xing Ziggy Zeng, Foucauld Chamming's, Jocelyne Arseneau, Lili Fu, Lucy Gilbert, Benoit Gallix, Caroline Reinhold
Purpose To evaluate the associations among mathematical modeling with the use of magnetic resonance (MR) imaging-based texture features and deep myometrial invasion (DMI), lymphovascular space invasion (LVSI), and histologic high-grade endometrial carcinoma. Materials and Methods Institutional review board approval was obtained for this retrospective study. This study included 137 women with endometrial carcinomas measuring greater than 1 cm in maximal diameter who underwent 1.5-T MR imaging before hysterectomy between January 2011 and December 2015...
May 10, 2017: Radiology
https://www.readbyqxmd.com/read/28493789/idiopathic-pulmonary-fibrosis-data-driven-textural-analysis-of-extent-of-fibrosis-at-baseline-and-15-month-follow-up
#7
Stephen M Humphries, Kunihiro Yagihashi, Jason Huckleberry, Byung-Hak Rho, Joyce D Schroeder, Matthew Strand, Marvin I Schwarz, Kevin R Flaherty, Ella A Kazerooni, Edwin J R van Beek, David A Lynch
Purpose To evaluate associations between pulmonary function and both quantitative analysis and visual assessment of thin-section computed tomography (CT) images at baseline and at 15-month follow-up in subjects with idiopathic pulmonary fibrosis (IPF). Materials and Methods This retrospective analysis of preexisting anonymized data, collected prospectively between 2007 and 2013 in a HIPAA-compliant study, was exempt from additional institutional review board approval. The extent of lung fibrosis at baseline inspiratory chest CT in 280 subjects enrolled in the IPF Network was evaluated...
May 10, 2017: Radiology
https://www.readbyqxmd.com/read/28481195/prevalence-of-fatty-liver-disease-and-hepatic-iron-overload-in-a-northeastern-german-population-by-using-quantitative-mr-imaging
#8
Jens-Peter Kühn, Peter Meffert, Christian Heske, Marie-Luise Kromrey, Carsten O Schmidt, Birger Mensel, Henry Völzke, Markus M Lerch, Diego Hernando, Julia Mayerle, Scott B Reeder
Purpose To quantify liver fat and liver iron content by measurement of confounder-corrected proton density fat fraction (PDFF) and R2* and to identify clinical associations for fatty liver disease and liver iron overload and their prevalence in a large-scale population-based study. Materials and Methods From 2008 to 2013, 2561 white participants (1336 women; median age, 52 years; 25th and 75th quartiles, 42 and 62 years) were prospectively recruited to the Study of Health in Pomerania (SHIP). Complex chemical shift-encoded magnetic resonance (MR) examination of the liver was performed, from which PDFF and R2* were assessed...
May 5, 2017: Radiology
https://www.readbyqxmd.com/read/28481194/primary-rectal-cancer-repeatability-of-global-and-local-regional-mr-imaging-texture-features
#9
Sofia Gourtsoyianni, Georgia Doumou, Davide Prezzi, Benjamin Taylor, J James Stirling, N Jane Taylor, Musib Siddique, Gary J R Cook, Robert Glynne-Jones, Vicky Goh
Purpose To assess the day-to-day repeatability of global and local-regional magnetic resonance (MR) imaging texture features derived from primary rectal cancer. Materials and Methods After ethical approval and patient informed consent were obtained, two pretreatment T2-weighted axial MR imaging studies performed prospectively with the same imaging unit on 2 consecutive days in 14 patients with rectal cancer (11 men [mean age, 61.7 years], three women [mean age, 70.0 years]) were analyzed to extract (a) global first-order statistical histogram and model-based fractal features reflecting the whole-tumor voxel intensity histogram distribution and repeating patterns, respectively, without spatial information and (b) local-regional second-order and high-order statistical texture features reflecting the intensity and spatial interrelationships between adjacent in-plane or multiplanar voxels or regions, respectively...
May 5, 2017: Radiology
https://www.readbyqxmd.com/read/28471738/regional-ventilation-changes-in-the-lung-treatment-response-mapping-by-using-hyperpolarized-gas-mr-imaging-as-a-quantitative-biomarker
#10
Felix C Horn, Helen Marshall, Guilhem J Collier, Richard Kay, Salman Siddiqui, Christopher E Brightling, Juan Parra-Robles, Jim M Wild
Purpose To assess the magnitude of regional response to respiratory therapeutic agents in the lungs by using treatment response mapping (TRM) with hyperpolarized gas magnetic resonance (MR) imaging. TRM was used to quantify regional physiologic response in adults with asthma who underwent a bronchodilator challenge. Materials and Methods This study was approved by the national research ethics committee and was performed with informed consent. Imaging was performed in 20 adult patients with asthma by using hyperpolarized helium 3 ((3)He) ventilation MR imaging...
May 4, 2017: Radiology
https://www.readbyqxmd.com/read/28471737/mr-elastography-derived-stiffness-a-biomarker-for-intervertebral-disc-degeneration
#11
Benjamin A Walter, Prasath Mageswaran, Xiaokui Mo, Daniel J Boulter, Hazem Mashaly, Xuan V Nguyen, Luciano M Prevedello, William Thoman, Brian D Raterman, Prateek Kalra, Ehud Mendel, William S Marras, Arunark Kolipaka
Purpose To determine the repeatability of magnetic resonance (MR) elastography-derived shear stiffness measurements of the intervertebral disc (IVD) taken throughout the day and their relationship with IVD degeneration and subject age. Materials and Methods In a cross-sectional study, in vivo lumbar MR elastography was performed once in the morning and once in the afternoon in 47 subjects without current low back pain (IVDs = 230; age range, 20-71 years) after obtaining written consent under approval of the institutional review board...
May 4, 2017: Radiology
https://www.readbyqxmd.com/read/28467143/contrast-enhanced-us-assisted-percutaneous-nephrostomy-a-technique-to-increase-success-rate-for-patients-with-nondilated-renal-collecting-system
#12
Bao X Liu, Guang L Huang, Xiao H Xie, Bo W Zhuang, Xiao Y Xie, Ming D Lu
Purpose To perform a single-center study of contrast material-enhanced ultrasonography (US)-assisted percutaneous nephrostomy (PCN) for patients with nondilated renal collecting system. Materials and Methods An international review board approved this retrospective study with waiver of informed consent for participation, and the study was approved by the Ethical Committee. From November 2011 to September 2015, 47 patients (mean age, 51.9 years ± 16.2 [standard deviation]; range, 18-80 years) with clinical necessity of urinary drainage, urinary diversion, or provision of access to the collecting system and with nondilated renal collecting system who underwent contrast-enhanced US-assisted PCN for 48 kidneys were included...
May 3, 2017: Radiology
https://www.readbyqxmd.com/read/28467142/monitoring-neoadjuvant-chemotherapy-for-breast-cancer-by-using-three-dimensional-subharmonic-aided-pressure-estimation-and-imaging-with-us-contrast-agents-preliminary-experience
#13
Kibo Nam, John R Eisenbrey, Maria Stanczak, Anush Sridharan, Adam C Berger, Tiffany Avery, Juan P Palazzo, Flemming Forsberg
Purpose To determine whether three-dimensional subharmonic aided pressure estimation (SHAPE) and subharmonic imaging can help predict the response of breast cancer to neoadjuvant chemotherapy. Materials and Methods In this HIPAA-compliant prospective study, 17 women (age range, 45-70 years) scheduled to undergo neoadjuvant therapy for breast cancer underwent ultrasonography (US) immediately before therapy and at completion of 10%, 60%, and 100% of chemotherapy. All patients provided written informed consent...
May 3, 2017: Radiology
https://www.readbyqxmd.com/read/28463057/is-weight-loss-associated-with-less-progression-of-changes-in-knee-articular-cartilage-among-obese-and-overweight-patients-as-assessed-with-mr-imaging-over-48-months-data-from-the-osteoarthritis-initiative
#14
Alexandra S Gersing, Benedikt J Schwaiger, Michael C Nevitt, Gabby B Joseph, Nattagan Chanchek, Julio B Guimaraes, John Mbapte Wamba, Luca Facchetti, Charles E McCulloch, Thomas M Link
Purpose To investigate the association of weight loss with progression of cartilage changes at magnetic resonance (MR) imaging over 48 months in overweight and obese participants compared with participants of stable weight. Materials and Methods The institutional review boards of the four participating centers approved this HIPAA-compliant study. Included were (a) 640 participants (mean age, 62.9 years ± 9.1 [standard deviation]; 398 women) who were overweight or obese (body mass index cutpoints of 25 and 30 kg/m(2), respectively) from the Osteoarthritis Initiative, with risk factors for osteoarthritis or mild to moderate radiographic findings of osteoarthritis, categorized into groups with (a) weight loss of more than 10% (n = 82), (b) weight loss of 5%-10% (n = 238), or (c) stable weight (n = 320) over 48 months...
May 2, 2017: Radiology
https://www.readbyqxmd.com/read/28453433/diagnostic-accuracy-of-selective-3-t-mr-neurography-guided-retroperitoneal-genitofemoral-nerve-blocks-for-the-diagnosis-of-genitofemoral-neuralgia
#15
Jan Fritz, A Lee Dellon, Eric H Williams, Gedge D Rosson, Allan J Belzberg, Frederick E Eckhauser
Purpose To determine if 3-T magnetic resonance (MR) neurography-guided retroperitoneal genitofemoral nerve (GFN) blocks are safe and effective for the diagnosis of genitofemoral neuralgia. Materials and Methods Following institutional review board approval and informed consent, 26 subjects (16 men, 10 women; mean age, 42 years [range, 24-78 years]; mean body mass index, 28 kg/m(2) [range, 20-35 kg/m(2)]) with intractable groin pain were included. By using a 3-T MR imaging system, intermediate-weighted turbo spin-echo pulse sequences, and MR-conditional needles, diagnostic MR neurography-guided GFN blocks were performed in the retroperitoneum...
April 28, 2017: Radiology
https://www.readbyqxmd.com/read/28453432/multiregional-radiogenomic-assessment-of-prostate-microenvironments-with-multiparametric-mr-imaging-and-dna-whole-exome-sequencing-of-prostate-glands-with-adenocarcinoma
#16
Neema Jamshidi, Daniel J Margolis, Steven Raman, Jiaoti Huang, Robert E Reiter, Michael D Kuo
Purpose To assess the underlying genomic variation of prostate gland microenvironments of patients with prostate adenocarcinoma in the context of colocalized multiparametric magnetic resonance (MR) imaging and histopathologic assessment of normal and abnormal regions by using whole-exome sequencing. Materials and Methods Six patients with prostate adenocarcinoma who underwent robotic prostatectomy with whole-mount preservation of the prostate were identified, which enabled spatial mapping between preoperative multiparametric MR imaging and the gland...
April 28, 2017: Radiology
https://www.readbyqxmd.com/read/28453431/safety-and-efficacy-of-irreversible-electroporation-for-the-treatment-of-hepatocellular-carcinoma-not-amenable-to-thermal-ablation-techniques-a-retrospective-single-center-case-series
#17
Olivier Sutter, Joyce Calvo, Gisèle N'Kontchou, Jean-Charles Nault, Raffik Ourabia, Pierre Nahon, Nathalie Ganne-Carrié, Valérie Bourcier, Nora Zentar, Fatna Bouhafs, Nicolas Sellier, Abou Diallo, Olivier Seror
Purpose To assess the safety and efficacy of irreversible electroporation (IRE) in the treatment of patients with inoperable hepatocellular carcinoma (HCC) who are ineligible for thermal ablative techniques. Materials and Methods This retrospective study was approved by an ethics review board, and the requirement to obtain informed written consent was waived. From March 2012 to June 2015, 58 patients (median age, 65.4 years; range 41.6-90 years) with cirrhosis received IRE for the treatment of 75 HCC tumors...
April 28, 2017: Radiology
https://www.readbyqxmd.com/read/28448235/intracranial-artery-steno-occlusion-diagnosis-by-using-three-dimensional-parallel-multichannel-transmission-mr-imaging
#18
Mi Sun Chung, Seung Chai Jung, Seon-Ok Kim, Ho Sung Kim, Choong Gon Choi, Sang Joon Kim, Sun U Kwon, Dong-Wha Kang, Jong S Kim
Purpose To determine whether magnetic resonance (MR) imaging by using two-dimensional spatially selective radiofrequency (RF) excitation pulses (zoomed MR imaging) is a reliable method for the diagnosis of intracranial artery steno-occlusion compared with full-field-of-view (FOV) MR imaging. Materials and Methods The institutional review board approved this retrospective study and informed consent was waived. From December 2014 to August 2015, 88 patients who underwent both full-FOV MR imaging and zoomed MR imaging for further evaluation of intracranial artery steno-occlusion at prior luminal evaluation were included...
April 27, 2017: Radiology
https://www.readbyqxmd.com/read/28448234/leveraging-clinical-imaging-archives-for-radiomics-reliability-of-automated-methods-for-brain-volume-measurement
#19
Viraj R Adduru, Andrew M Michael, Maria Helguera, Stefi A Baum, Gregory J Moore
Purpose To validate the use of thick-section clinically acquired magnetic resonance (MR) imaging data for estimating total brain volume (TBV), gray matter (GM) volume (GMV), and white matter (WM) volume (WMV) by using three widely used automated toolboxes: SPM ( www.fil.ion.ucl.ac.uk/spm/ ), FreeSurfer ( surfer.nmr.mgh.harvard.edu ), and FSL (FMRIB software library; Oxford Centre for Functional MR Imaging of the Brain, Oxford, England, https://fsl.fmrib.ox.ac.uk/fsl ). Materials and Methods MR images from a clinical archive were used and data were deidentified...
April 27, 2017: Radiology
https://www.readbyqxmd.com/read/28448233/t1-and-t2-mapping-in-recognition-of-early-cardiac-involvement-in-systemic-sarcoidosis
#20
Valentina O Puntmann, Alexander Isted, Rocio Hinojar, Lucy Foote, Gerald Carr-White, Eike Nagel
Purpose To determine whether quantitative tissue characterization with T1 and T2 mapping supports recognition of myocardial involvement in patients with systemic sarcoidosis. Materials and Methods Fifty-three consecutive patients with a biopsy-proven extracardiac diagnosis of systemic sarcoidosis (21 men; median age, 45 years; interquartile range, 22 years) and 36 normotensive previously healthy control subjects (14 men; median age, 43 years; interquartile range, 18 years) underwent cardiovascular magnetic resonance imaging, which was performed to assess cardiac function and late gadolinium enhancement, and T1 and T2 mapping...
April 27, 2017: Radiology
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