keyword
MENU ▼
Read by QxMD icon Read
search

Pancreas MR

keyword
https://www.readbyqxmd.com/read/28808290/molecular-mr-imaging-of-fibrosis-in-a-mouse-model-of-pancreatic-cancer
#1
Miloslav Polasek, Yan Yang, Daniel T Schühle, Mohammad A Yaseen, Young R Kim, Yu Sub Sung, Alexander R Guimaraes, Peter Caravan
Fibrosis with excessive amounts of type I collagen is a hallmark of many solid tumours, and fibrosis is a promising target in cancer therapy, but tools for its non-invasive quantification are missing. Here we used magnetic resonance imaging with a gadolinium-based probe targeted to type I collagen (EP-3533) to image and quantify fibrosis in pancreatic ductal adenocarcinoma. An orthotopic syngeneic mouse model resulted in tumours with 2.3-fold higher collagen level compared to healthy pancreas. Animals were scanned at 4...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715967/hyperthermia-enhanced-targeted-drug-delivery-using-magnetic-resonance-guided-focussed-ultrasound-a-pre-clinical-study-in-a-genetic-model-of-pancreatic-cancer
#2
Navid Farr, Yak-Nam Wang, Samantha D'Andrea, Frank Starr, Ari Partanen, Kayla M Gravelle, Jeannine S McCune, Linda J Risler, Stella G Whang, Amy Chang, Sunil R Hingorani, Donghoon Lee, Joo Ha Hwang
PURPOSE: The lack of effective treatment options for pancreatic cancer has led to a 5-year survival rate of just 8%. Here, we evaluate the ability to enhance targeted drug delivery using mild hyperthermia in combination with the systemic administration of a low-temperature sensitive liposomal formulation of doxorubicin (LTSL-Dox) using a relevant model for pancreas cancer. MATERIALS AND METHODS: Experiments were performed in a genetically engineered mouse model of pancreatic cancer (KPC mice: LSL-Kras(G12D/+); LSL-Trp53(R172H/+); Pdx-1-Cre)...
July 17, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28692137/portable-perfusion-phantom-for-quantitative-dce-mri-of-the-abdomen
#3
Harrison Kim, Mina Mousa, Patrick Schexnailder, Robert Hergenrother, Mark Bolding, Bernard Ntsikoussalabongui, Vinoy Thomas, Desiree E Morgan
PURPOSE: To develop a portable perfusion phantom and validate its utility in quantitative dynamic contrast-enhanced magnetic resonance imaging of the abdomen. METHODS: A portable perfusion phantom yielding a reproducible contrast enhancement curve (CEC) was developed. A phantom package including perfusion and static phantoms were imaged simultaneously with each of three healthy human volunteers in two different 3T MR scanners. Look-up tables correlating reference (known) contrast concentrations with measured ones were created using either the static or perfusion phantom...
July 10, 2017: Medical Physics
https://www.readbyqxmd.com/read/28652096/mr-imaging-of-endometriosis-spectrum-of-disease
#4
C Bourgioti, O Preza, E Panourgias, K Chatoupis, A Antoniou, M E Nikolaidou, L A Moulopoulos
Endometriosis is a common gynecological disorder defined by the presence of endometrial tissue outside the uterus. It is the most common cause of chronic pelvic pain and typically affects the ovaries, uterine ligaments, peritoneum, tubes, rectovaginal septum and bladder. It may, however, be found at various extrapelvic sites, including the perineum, liver, pancreas, lung or even the central nervous system, and in such cases, diagnosis may be quite challenging. Even though definitive diagnosis requires laparoscopy, preoperative identification of endometriosis is important not only to differentiate it from other diseases with similar clinical presentations but also, for accurate presurgical mapping, since complete removal of all endometriotic foci is critical for the effective treatment of the patient's symptoms...
June 23, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28646608/fluid-filling-of-the-digestive-tract-for-improved-proton-resonance-frequency-shift-based-mr-thermometry-in-the-pancreas
#5
Cyril J Ferrer, Lambertus W Bartels, Marijn van Stralen, Baudouin Denis de Senneville, Chrit T W Moonen, Clemens Bos
PURPOSE: To demonstrate that fluid filling of the digestive tract improves the performance of respiratory motion-compensated proton resonance frequency shift (PRFS)-based magnetic resonance (MR) thermometry in the pancreas. MATERIALS AND METHODS: In seven volunteers (without heating), we evaluated PRFS thermometry in the pancreas with and without filling of the surrounding digestive tract. All data acquisition was performed at 1.5T, then all datasets were analyzed and compared with three different PRFS respiratory motion-compensated thermometry methods: gating, multibaseline, and referenceless...
June 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28624986/temperature-corrected-post-mortem-1-5%C3%A2-t-mri-quantification-of-non-pathologic-upper-abdominal-organs
#6
Nicole Schwendener, Christian Jackowski, Frederick Schuster, Anders Persson, Marcel J Warntjes, Wolf -Dieter Zech
OBJECTIVES: The present study aimed to evaluate if simultaneous temperature-corrected T1, T2, and proton density (PD) 1.5 T post-mortem MR quantification [quantitative post-mortem magnetic resonance imaging (QPMMRI)] is feasible for characterizing and discerning non-pathologic upper abdominal organs (liver, spleen, pancreas, kidney) with regard to varying body temperatures. METHODS: QPMMRI was performed on 80 corpses (25 females, 55 males; mean age 56.2 years, SD 17...
June 17, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28533666/comparison-of-imaging-based-and-pathological-dimensions-in-pancreatic-neuroendocrine-tumors
#7
Salvatore Paiella, Harmony Impellizzeri, Elisabetta Zanolin, Giovanni Marchegiani, Marco Miotto, Anna Malpaga, Riccardo De Robertis, Mirko D'Onofrio, Borislav Rusev, Paola Capelli, Sara Cingarlini, Giovanni Butturini, Maria Vittoria Davì, Antonio Amodio, Claudio Bassi, Aldo Scarpa, Roberto Salvia, Luca Landoni
AIM: To establish the ability of magnetic resonance (MR) and computer tomography (CT) to predict pathologic dimensions of pancreatic neuroendocrine tumors (PanNET) in a caseload of a tertiary referral center. METHODS: Patients submitted to surgery for PanNET at the Surgical Unit of the Pancreas Institute with at least 1 preoperative imaging examination (MR or CT scan) from January 2005 to December 2015 were included and data retrospectively collected. Exclusion criteria were: multifocal lesions, genetic syndromes, microadenomas or mixed tumors, metastatic disease and neoadjuvant therapy...
May 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28390726/effects-of-preweaning-nutrient-intake-in-the-developing-mammary-parenchymal-tissue
#8
F Soberon, M E Van Amburgh
Historically, mammary gland growth has been considered isometric the first 2 mo of life and then allometric until peripuberty. However, recent work indicated that the mammary gland might be responsive to nutrient intake preweaning. The objectives of this study were to describe the effects of nutrient intake preweaning on mammary gland development and to investigate cell specific proliferation during this phase of development. Twelve dairy heifer calves were fed either a fixed amount of milk replacer (MR; control, n = 6) or an amount of MR adjusted for BW (enhanced, n = 6)...
April 5, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28369092/quantification-of-intrapancreatic-fat-in-type-2-diabetes-by-mri
#9
Ahmad Al-Mrabeh, Kieren G Hollingsworth, Sarah Steven, Dina Tiniakos, Roy Taylor
OBJECTIVES: Accumulation of intrapancreatic fat may be important in type 2 diabetes, but widely varying data have been reported. The standard quantification by MRI in vivo is time consuming and dependent upon a high level of experience. We aimed to develop a new method which would minimise inter-observer variation and to compare this against previously published datasets. METHODS: A technique of 'biopsying' the image to minimise inclusion of non-parenchymal tissues was developed...
2017: PloS One
https://www.readbyqxmd.com/read/28344687/disseminated-pancreatic-neuroendocrine-neoplasm-nen-with-an-uncommon-localisation-in-the-central-nervous-system-a-case-report
#10
Joanna Białkowska, Agnieszka Kolasińska-Ćwikła, Dorota Mroczkowska, Mariusz Sowa, Łukasz Grabarczyk, Wojciech Maksymowicz, Andrzej Cichocki, Jarosław B Ćwikła
BACKGROUND: Neuroendocrine neoplasms (NEN) are rare neoplasms that originate from neuroendocrine cells and are characterized by the potential of hormonal activity. Approximately 70% of these tumours are located in the gastrointestinal system (GI), followed by the bronchi, endocrine glands-like C cells of the thyroid (medullary carcinoma), the parasympathetic and sympathetic system (paragangliomas, pheochromocytoma) and other very rare locations. The prevalence of cerebral metastases in neuroendocrine tumours is estimated by various authors to be approximately 1...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28306727/biodistribution-and-pet-imaging-of-pharmacokinetics-of-manganese-in-mice-using-manganese-52
#11
A Lake Wooten, Tolulope A Aweda, Benjamin C Lewis, Rebecca B Gross, Suzanne E Lapi
Manganese is essential to life, and humans typically absorb sufficient quantities of this element from a normal healthy diet; however, chronic, elevated ingestion or inhalation of manganese can be neurotoxic, potentially leading to manganism. Although imaging of large amounts of accumulated Mn(II) is possible by MRI, quantitative measurement of the biodistribution of manganese, particularly at the trace level, can be challenging. In this study, we produced the positron-emitting radionuclide 52Mn (t1/2 = 5.6 d) by proton bombardment (Ep<15 MeV) of chromium metal, followed by solid-phase isolation by cation-exchange chromatography...
2017: PloS One
https://www.readbyqxmd.com/read/28280965/radiosynthesis-and-first-in-human-pet-mri-evaluation-with-clinical-grade-18-f-ftc-146
#12
Bin Shen, Jun Hyung Park, Trine Hjørnevik, Peter W Cipriano, Daehyun Yoon, Praveen K Gulaka, Dawn Holly, Deepak Behera, Bonnie A Avery, Sanjiv S Gambhir, Christopher R McCurdy, Sandip Biswal, Frederick T Chin
PURPOSE: Sigma-1 receptors (S1Rs) play an important role in many neurological disorders. Simultaneous positron emission tomography (PET)/magnetic resonance imaging (MRI) with S1R radioligands may provide valuable information for diagnosing and guiding treatment for these diseases. Our previously reported S1R radioligand, [(18)F]FTC-146, demonstrated high affinity for the S1R (K i = 0.0025 nM) and excellent selectivity for the S1R over the sigma-2 receptor (S2Rs; K i = 364 nM) across several species (from mouse to non-human primate)...
March 9, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28188872/pre-transplantation-31-p-magnetic-resonance-spectroscopy-for-quality-assessment-of-human-pancreatic-grafts-a-feasibility-study
#13
Lina Carlbom, Jan Weis, Lars Johansson, Olle Korsgren, Håkan Ahlström
OBJECTIVE: To investigate the feasibility of using (31)P-MRS for objective non-invasive quality assessment of human pancreas grafts prior to transplantation or islet isolation. MATERIALS AND METHODS: Pancreata from 5 human donors, 3 males and 2 females, aged 49-78years, with body mass index (BMI) 22-31kg/m(2), were included. Pancreata were perfused with histidine-tryptophan-ketoglutarate solution during procurement and stored in hypothermic condition (4°C) for 21-44h...
June 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28121369/four-dimensional-diffusion-weighted-mr-imaging-4d-dwi-a-feasibility-study
#14
Yilin Liu, Xiaodong Zhong, Brian G Czito, Manisha Palta, Mustafa R Bashir, Brian M Dale, Fang-Fang Yin, Jing Cai
PURPOSE: Diffusion-weighted Magnetic Resonance Imaging (DWI) has been shown to be a powerful tool for cancer detection with high tumor-to-tissue contrast. This study aims to investigate the feasibility of developing a four-dimensional DWI technique (4D-DWI) for imaging respiratory motion for radiation therapy applications. MATERIALS/METHODS: Image acquisition was performed by repeatedly imaging a volume of interest (VOI) using an interleaved multislice single-shot echo-planar imaging (EPI) 2D-DWI sequence in the axial plane...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28120404/functional-mri-of-human-pancreas-using-bold-contrast-responses-following-glucose-ingestion
#15
Bozhu Chen, Weibo Chen, Queenie Chan, Nan Zhou, Jian He, Zhengyang Zhou
PURPOSE: To evaluate the response of the pancreas to glucose ingestion in healthy volunteers by blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI). MATERIALS AND METHODS: This study was approved by the local Ethics Committee, and informed consent was obtained from all subjects. A multiple gradient recalled echo (mGRE) sequence was performed on a 3.0T MR scanner in 12 healthy volunteers before and after glucose or water ingestion. Pancreatic T2* values were calculated from it at each timepoint, and changes following stimulation were analyzed using summary measures...
January 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28099362/laparoscopic-pancreaticoduodenectomy-in-a-92-older-chinese-patient-for-cancer-of-head-of-the-pancreas-a-case-report
#16
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
#17
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...
June 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28048275/su-f-j-168-dosimetric-impact-of-mr-image-distortion-in-treatment-planning
#18
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
#19
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
#20
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
keyword
keyword
66236
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"