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Pancreas MR

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https://www.readbyqxmd.com/read/28099362/laparoscopic-pancreaticoduodenectomy-in-a-92-older-chinese-patient-for-cancer-of-head-of-the-pancreas-a-case-report
#1
Jiayu Zhou, Chang Xin, Tao Xia, Yiping Mou, Xiaowu Xu, Renchao Zhang, Yucheng Zhou, Weiwei Jin, Chao Lu
INTRODUCTION: Laparoscopic pancreaticoduodenectomy (LPD) is one of the most complex gastrointestinal procedures performed in laparoscopic abdominal surgery. However, the concern for elderly undergoing LPD remains. To the best of our knowledge, there are no reports describing LPD for A-92-older patient. This study aimed to share the experience of a tertiary pancreatic center and confirm the safety, feasibility of LPD for the elderly. METHOD: The patient had complained of 6-months history of abdominal discomfort and progressive jaundice...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28091744/prediction-of-pancreatic-fistula-after-distal-pancreatectomy-based-on-cross-sectional-images
#2
Ye Rim Chang, Jae Seung Kang, Jin-Young Jang, Woo Hyun Jung, Mee Joo Kang, Kyung Bun Lee, Sun-Whe Kim
BACKGROUND: Postoperative pancreatic fistula (POPF) is one of the most common and clinically relevant complications after distal pancreatectomy (DP), occurring in 5-40% of patients. Determining risk factors for this complication may aid in its prevention. This study sought to predict the development of POPF after DP preoperatively and objectively based on radiologic findings. METHODS: This study included 60 patients who underwent DP using a stapler for pancreatic division between June 2011 and January 2013...
January 13, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28048275/su-f-j-168-dosimetric-impact-of-mr-image-distortion-in-treatment-planning
#3
Y Yan, J Yang, S Beddar, G Ibbott, P Balter, R Kudchadker, S Krishnan, C Fuller, J Wang
PURPOSE: To evaluate the dosimetric impact of MR image distortion in treatment planning. METHODS: Based on the realistic MRI distortion measurement data from an integrated MRI-Linac system, we created a generalized distortion model and applied it to CT images to simulate distorted MRI images. Ten patients with IMRT plans generated in Pinnacle treatment planning system in 5 anatomical cancer sites (lung, prostate, spinal cord, liver, and pancreas) were retrospectively selected for the simulation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047704/su-g-jep2-05-dose-effects-of-a-1-5t-magnetic-field-on-air-tissue-and-lung-tissue-interfaces-in-mri-guided-radiotherapy
#4
Xinfeng Chen, Phillip Prior, Guangpei Chen, Christopher Schultz, X Allen Li
PURPOSE: The purpose of the study is to investigate the dose effects of electron-return-effect (ERE) at air-tissue and lung-tissue interfaces under a 1.5T transverse-magnetic-field (TMF). METHODS: IMRT and VMAT plans for representative pancreas, lung, breast and head & neck (H&N) cases were generated following clinical dose volume (DV) criteria. The air-cavity walls, as well as the lung wall, were delineated to examine the ERE. In each case, the original plan generated without TMF is compared with the reconstructed plan (generated by recalculating the original plan with the presence of TMF) and the optimized plan (generated by a full optimization with TMF), using a variety of DV parameters, including V100%, D95% and dose heterogeneity index for PTV, Dmax, and D1cc for OARs (organs at risk) and tissue interface...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047289/tu-ab-bra-11-indications-for-online-adaptive-radiotherapy-based-on-dosimetric-consequences-of-interfractional-pancreas-to-duodenum-motion-in-mri-guided-pancreatic-radiotherapy
#5
K Mittauer, S Rosenberg, M Geurts, M Bassetti, I Chen, L Henke, J Olsen, R Kashani, A Wojcieszynski, P Harari, Z Labby, P Hill, B Paliwal, P Parikh, J Bayouth
PURPOSE: Dose limiting structures, such as the duodenum, render the treatment of pancreatic cancer challenging. In this multi-institutional study, we assess dosimetric differences caused by interfraction pancreas-to-duodenum motion using MR-IGRT to determine the potential impact of adaptive replanning. METHODS: Ten patients from two institutions undergoing MRI-guided radiotherapy with conventional fractionation (n=5) or SBRT (n=5) for pancreatic cancer were included...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047210/th-ab-bra-07-penelope-based-gpu-accelerated-dose-calculation-system-applied-to-mri-guided-radiation-therapy
#6
Y Wang, T Mazur, O Green, Y Hu, H Li, V Rodriguez, H Wooten, D Yang, T Zhao, S Mutic, H Li
PURPOSE: The clinical commissioning of IMRT subject to a magnetic field is challenging. The purpose of this work is to develop a GPU-accelerated Monte Carlo dose calculation platform based on PENELOPE and then use the platform to validate a vendor-provided MRIdian head model toward quality assurance of clinical IMRT treatment plans subject to a 0.35 T magnetic field. METHODS: We first translated PENELOPE from FORTRAN to C++ and validated that the translation produced equivalent results...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046990/su-d-202-03-statistical-segmentation-on-quantitative-ct-for-assessing-spatial-tumor-response-during-radiation-therapy-delivery
#7
D Schott, T Schmidt, X Chen, S Klawikowski, G Noid, E Dalah, X Li
PURPOSE: Develop a method to segment regions of interest (ROIs) in tumor with statistically similar Hounsfield unit (HU) values and/or HU changes during chemoradiation therapy (CRT) delivery, to assess spatial tumor treatment response based on daily CTs during CRT delivery. METHODS: Generate a three region map of ROIs with differential HUs, by sampling neighboring voxels around a selected voxel and comparing to the mean of the entire ROI using a t-test. The cumulative distribution function, P, is calculated from the t-test...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046785/su-f-j-173-online-replanning-for-dose-painting-based-on-changing-adc-map-of-pancreas-cancer
#8
O Ates, E Ahunbay, B Erickson, X Li
PURPOSE: The introduction of MR-guided radiation therapy (RT), e.g., MR-Linac, would allow dose painting to adapt spatial RT response revealed from MRI data during the RT delivery. The purpose of this study is to investigate the use of an online replanning method to adapt dose painting from the MRI Apparent Diffusion Coefficient (ADC) map acquired during the delivery of RT for pancreatic cancers. METHODS: Original dose painting plans were created based on multi-parametric simulation MRI including T1, T2 and ADC, using a treatment planning system (MONACO, Elekta) equipped with an online replanning algorithm (WSO, warm start optimization)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28027747/imaging-findings-of-kaposiform-hemangioendothelioma-in-children
#9
Young Jin Ryu, Young Hun Choi, Jung-Eun Cheon, Woo Sun Kim, In-One Kim, Ji Eun Park, Yu Jin Kim
PURPOSE: Kaposiform hemangioendothelioma (KHE) is a rare, aggressive vascular tumor that typically occurs during infancy or early childhood. Though several case reports have discussed the imaging findings of KHE, larger comprehensive studies are lacking. The purpose of this study was to evaluate the imaging findings of KHE in children. MATERIALS AND METHODS: A total of twelve cases of pathologically proven KHE were collected by searching our institution's pathology database for children diagnosed between January 2004 and April 2016 (6 male, 6 female; median age: 3 months; age range 7days - 18 years)...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/27898201/diffusion-weighted-imaging-of-the-abdomen-impact-of-b-values-on-texture-analysis-features
#10
Anton S Becker, Matthias W Wagner, Moritz C Wurnig, Andreas Boss
The purpose of this work was to systematically assess the impact of the b-value on texture analysis in MR diffusion-weighted imaging (DWI) of the abdomen. In eight healthy male volunteers, echo-planar DWI sequences at 16 b-values ranging between 0 and 1000 s/mm(2) were acquired at 3 T. Three different apparent diffusion coefficient (ADC) maps were computed (0, 750/100, 390, 750 s/mm(2) /all b-values). Texture analysis of rectangular regions of interest in the liver, kidney, spleen, pancreas, paraspinal muscle and subcutaneous fat was performed on DW images and the ADC maps, applying 19 features computed from the histogram, grey-level co-occurrence matrix (GLCM) and grey-level run-length matrix (GLRLM)...
January 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/27868105/feasibility-of-automated-3-dimensional-magnetic-resonance-imaging-pancreas-segmentation
#11
Shuiping Gou, Percy Lee, Peng Hu, Jean-Claude Rwigema, Ke Sheng
PURPOSE: With the advent of MR guided radiotherapy, internal organ motion can be imaged simultaneously during treatment. In this study, we evaluate the feasibility of pancreas MRI segmentation using state-of-the-art segmentation methods. METHODS AND MATERIAL: T2 weighted HASTE and T1 weighted VIBE images were acquired on 3 patients and 2 healthy volunteers for a total of 12 imaging volumes. A novel dictionary learning (DL) method was used to segment the pancreas and compared to t mean-shift merging (MSM), distance regularized level set (DRLS), graph cuts (GC) and the segmentation results were compared to manual contours using Dice's index (DI), Hausdorff distance and shift of the-center-of-the-organ (SHIFT)...
July 2016: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/27832518/expanding-the-scope-of-an-automated-radiology-recommendation-tracking-engine-initial-experiences-and-lessons-learned
#12
Mindy Y Licurse, Darco Lalevic, Hanna M Zafar, Mitchell D Schnall, Tessa S Cook
An automated radiology recommendation-tracking engine for incidental focal masses in the liver, pancreas, kidneys, and adrenal glands was launched within our institution in July 2013. For 2 years, the majority of CT, MR, and US examination reports generated within our health system were mined by the engine. However, the need to expand the system beyond the initial four organs was soon identified. In July 2015, the second phase of the system was implemented and expanded to include additional anatomic structures in the abdomen and pelvis, as well as to provide non-radiology and non-imaging options for follow-up...
November 10, 2016: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/27760203/correction-preliminary-study-of-mr-diffusion-tensor-imaging-of-pancreas-for-the-diagnosis-of-acute-pancreatitis
#13
Xinghui Li, Ling Zhuang, Xiaoming Zhang, Jian Wang, Tianwu Chen, Liangjun Li, Emmanuel Ajedichiga Aduah, Jiani Hu
[This corrects the article DOI: 10.1371/journal.pone.0160115.].
2016: PloS One
https://www.readbyqxmd.com/read/27699875/tomoelastography-of-the-abdomen-tissue-mechanical-properties-of-the-liver-spleen-kidney-and-pancreas-from-single-mr-elastography-scans-at-different-hydration-states
#14
Florian Dittmann, Heiko Tzschätzsch, Sebastian Hirsch, Eric Barnhill, Jürgen Braun, Ingolf Sack, Jing Guo
PURPOSE: To develop a compact magnetic resonance elastography (MRE) protocol for abdomen and to investigate the effect of water uptake on tissue stiffness in the liver, spleen, kidney, and pancreas. METHODS: Nine asymptomatic volunteers were investigated by MRE before and after 1 liter water uptake. Shear-wave excitation at four frequencies was transferred to the abdomen from anterior and posterior directions using pressurized air drivers. Tomographic representations of shear-wave speed were produced by analysis of multifrequency wave numbers in axial and coronal images acquired within four breath-holds or under free breathing, respectively...
October 3, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27660281/detection-of-exocrine-dysfunction-by-mri-in-patients-with-early-chronic-pancreatitis
#15
Temel Tirkes, Evan L Fogel, Stuart Sherman, Chen Lin, Jordan Swensson, Fatih Akisik, Kumaresan Sandrasegaran
PURPOSE: To determine if T1-weighted MR signal of the pancreas can be used to detect early CP. METHODS: A retrospective analysis was performed on 51 suspected CP patients, who had both secretin-enhanced magnetic resonance cholangiopancreatography (S-MRCP) and an intraductal secretin stimulation test (IDST). There were 29 patients in normal and 22 patients in the low bicarbonate group. Bicarbonate level, total pancreatic juice volume, and excretory flow rate were recorded during IDST...
September 23, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27624753/in-vivo-and-ex-vivo-19-fluorine-magnetic-resonance-imaging-and-spectroscopy-of-beta-cells-and-pancreatic-islets-using-glut-2-specific-contrast-agents
#16
Sayuan Liang, Karim Louchami, Hauke Kolster, Anna Jacobsen, Ying Zhang, Julian Thimm, Abdullah Sener, Joachim Thiem, Willy Malaisse, Tom Dresselaers, Uwe Himmelreich
The assessment of the β-cell mass in experimental models of diabetes and ultimately in patients is a hallmark to understand the relationship between reduced β-cell mass/function and the onset of diabetes. It has been shown before that the GLUT-2 transporter is highly expressed in both β-cells and hepatocytes and that D-mannoheptulose (DMH) has high uptake specificity for the GLUT-2 transporter. As 19-fluorine MRI has emerged as a new alternative method for MRI cell tracking because it provides potential non-invasive localization and quantification of labeled cells, the purpose of this project is to validate β-cell and pancreatic islet imaging by using fluorinated, GLUT-2 targeting mannoheptulose derivatives ((19) FMH) both in vivo and ex vivo...
November 2016: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/27616039/pancreas-divisum-a-risk-factor-for-pancreaticobiliary-tumors%C3%A2-%C3%A2-an-analysis-of-1628-mr-cholangiography-examinations
#17
Z H Adibelli, M Adatepe, L Isayeva, O S Esen, M Yildirim
PURPOSE: This retrospective study was conducted to evaluate the relationships between pancreas divisum, biliary duct anatomical variations and pancreaticobiliary tumors using magnetic resonance cholangiopancreatography (MRCP). MATERIALS AND METHOD: The MRCP examinations of 1628 patients were retrospectively reviewed for the presence of pancreas divisum, biliary duct anatomical variations and pancreaticobiliary tumors. Of these, 90 patients (31 men, 59 women) with a mean age of 62...
September 5, 2016: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/27591177/outcome-of-long-interval-radiological-surveillance-of-side-branch-pancreatic-duct-involved-intraductal-papillary-mucinous-neoplasm-in-selected-patients
#18
Yazan S Khaled, Muhammed Mohsin, Kavi Fatania, Ada Yee, Robert Adair, Maria Sheridan, Christian Macutkiewicz, Amer Aldouri, Andrew M Smith
INTRODUCTION: Side branch IPMN (SB-IPMN) of the pancreas has a malignancy rate between 10 and 20%. We hypothesized that surveillance at longer intervals on selected patients with SB-IPMN might be indicated. METHODS: This is a retrospective study of prospectively collected data of 276 patients presenting from 2000 to 2010. After 2007, we opted to screen our patients with longer intervals, initially at 12 months then 24 months using MR if no "worrisome features" were present...
November 2016: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/27584016/preliminary-study-of-mr-diffusion-tensor-imaging-of-pancreas-for-the-diagnosis-of-acute-pancreatitis
#19
Xinghui Li, Ling Zhuang, Xiaoming Zhang, Jian Wang, Tianwu Chen, Liangjun Li, Emmanuel Ajedichiga Aduah, Jiani Hu
OBJECTIVES: To evaluate the feasibility of differentiating between acute pancreatitis (AP) and healthy pancreas using diffusion tensor imaging (DTI) and correlate apparent diffusion coefficient (ADC) /fractional anisotropy (FA) values with the severity of AP. MATERIAL AND METHODS: 66 patients diagnosed with AP and 20 normal controls (NC) underwent DTI sequences and routine pancreatic MR sequences on a 3.0T MRI scanner. Average ADC and FA values of the pancreatic were measured...
2016: PloS One
https://www.readbyqxmd.com/read/27573371/extensive-heterotopic-gastric-mucosa-of-the-small-intestine-imaging-with-99m-tc-sodium-pertechnetate-spect-ct-enterography
#20
Andrew H Schapiro, Tom K Lin, Jason S Frischer, Ayaka Silverman, Andrew T Trout
Extensive heterotopic gastric mucosa of the small intestine is a rare, but potentially life-threatening condition characterized by multifocal or long-segment heterotopic gastric mucosa within the bowel lumen that is often associated with other anomalies including malrotation and annular pancreas. Although the imaging findings are characteristic, this entity may be unrecognized due to its unusual imaging appearance and rarity. CT or MR enterography and (99m)Tc-sodium pertechnetate scintigraphy can provide complementary information that enables specific diagnosis and accurate assessment of disease extent...
December 2016: Pediatric Radiology
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