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https://www.readbyqxmd.com/read/29761358/deep-learning-for-staging-liver-fibrosis-on-ct-a-pilot-study
#1
Koichiro Yasaka, Hiroyuki Akai, Akira Kunimatsu, Osamu Abe, Shigeru Kiryu
OBJECTIVES: To investigate whether liver fibrosis can be staged by deep learning techniques based on CT images. METHODS: This clinical retrospective study, approved by our institutional review board, included 496 CT examinations of 286 patients who underwent dynamic contrast-enhanced CT for evaluations of the liver and for whom histopathological information regarding liver fibrosis stage was available. The 396 portal phase images with age and sex data of patients (F0/F1/F2/F3/F4 = 113/36/56/66/125) were used for training a deep convolutional neural network (DCNN); the data for the other 100 (F0/F1/F2/F3/F4 = 29/9/14/16/32) were utilised for testing the trained network, with the histopathological fibrosis stage used as reference...
May 14, 2018: European Radiology
https://www.readbyqxmd.com/read/29758989/the-double-hazard-of-bleeding-and-thrombosis-in-hemostasis-from-a-clinical-point-of-view-a-global-assessment-by-rotational-thromboelastometry-rotem
#2
Olga Meltem Akay
Hemostasis is a complex dynamic process involving bleeding and thrombosis as two end-points. Conventional coagulation tests which are measured in plasma examine only isolated portions of the coagulation cascade, thereby giving no information on important interactions essential to the clinical evaluation of hemostatic function. Thromboelastography (TEG), originally described in 1948 has improved over the decades and become a valuable tool of coagulation testing because of the limitations of standard coagulation tests...
January 1, 2018: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/29736801/global-rigid-registration-of-ct-to-video-in-laparoscopic-liver-surgery
#3
Maria R Robu, João Ramalhinho, Stephen Thompson, Kurinchi Gurusamy, Brian Davidson, David Hawkes, Danail Stoyanov, Matthew J Clarkson
PURPOSE: Image-guidance systems have the potential to aid in laparoscopic interventions by providing sub-surface structure information and tumour localisation. The registration of a preoperative 3D image with the intraoperative laparoscopic video feed is an important component of image guidance, which should be fast, robust and cause minimal disruption to the surgical procedure. Most methods for rigid and non-rigid registration require a good initial alignment. However, in most research systems for abdominal surgery, the user has to manually rotate and translate the models, which is usually difficult to perform quickly and intuitively...
May 7, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29708625/role-of-the-wilms-tumor-suppressor-gene-wt1-in-pancreatic-development
#4
Laura Ariza, Ana Cañete, Anabel Rojas, Ramón Muñoz-Chápuli, Rita Carmona
The Wilms tumor suppressor gene (Wt1) encodes a transcription factor involved in the development of a number of organs, but the role played by Wt1 in pancreatic development is unknown. The pancreas contains a population of pancreatic stellate cells (PSC) very important for pancreatic physiology. We described elsewhere that hepatic stellate cells originate from the WT1-expressing liver mesothelium. Thus, we checked if the origin of PSCs was similar. WT1 is expressed in the pancreatic mesothelium. Between E10...
April 30, 2018: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/29703920/prevalent-metabolic-derangement-and-severe-thrombocytopenia-in-abo-incompatible-liver-recipients-with-pre-transplant-plasma-exchange
#5
Hye-Mee Kwon, In-Gu Jun, JungBok Lee, Young-Jin Moon, Kyeo-Woon Jung, Hye-Won Jeong, Yong-Seok Park, Jun-Gol Song, Gyu-Sam Hwang
Desensitisation with therapeutic plasma exchange (TPE) is essential for ABO-incompatible (ABO-I) liver transplants (LTs). However, excessive citrate load and coagulation disturbances after TPE have been poorly studied, in particular in cirrhotic patients with hypocapnic alkalosis, metabolic compensation and electrolyte imbalances. We retrospectively evaluated 1123 consecutive LT recipients (923 ABO-compatible [ABO-C], 200 ABO-I) from November 2008 to May 2015. TPE was generally performed a day before LT and blood sampling was performed before anaesthesia induction...
April 27, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29659268/human-liver-microsomes-atropselectively-metabolize-2-2-3-4-6-pentachlorobiphenyl-pcb-91-to-a-1-2-shift-product-as-the-major-metabolite
#6
Eric Uwimana, Xueshu Li, Hans-Joachim Lehmler
Polychlorinated biphenlys (PCBs) and their hydroxylated metabolites (OH-PCBs) have been implicated in neurodevelopmental disorders. Several neurotoxic PCBs, such as PCB 91, are chiral because they form stable rotational isomers, or atropisomers, that are non-superimposable mirror images of each other. Because only limited information about the metabolism of these PCBs by human cytochrome P450 (P450) enzymes is available, we investigated the biotransformation of PCB 91 to OH-PCBs by human liver microsomes (HLMs)...
April 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29519412/a-constrained-linear-regression-optimization-algorithm-for-diaphragm-motion-tracking-with-cone-beam-ct-projections
#7
Jie Wei, Ming Chao
PURPOSE: We presented a feasibility study to extract the diaphragm motion from the inferior contrast cone beam computed tomography (CBCT) projection images using a constrained linear regression optimization algorithm. METHODS: The shape of the diaphragm was fitted by a parabolic function which was initialized by five manually placed points on the diaphragm contour of a pre-selected projection. A constrained linear regression model by exploiting the spatial, algebraic, and temporal constraints of the diaphragm, approximated by a parabola, was employed to estimate the parameters...
February 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/29500650/mimics-of-malrotation-on-pediatric-upper-gastrointestinal-series-a-pictorial-review
#8
REVIEW
Anilawan Smitthimedhin, Angela Suarez, Ryan L Webb, Hansel J Otero
Intestinal malrotation is a continuum of congenital anomalies due to lack of rotation or incomplete rotation of the fetal intestine around the superior mesenteric artery axis. The abnormal bowel fixation (by mesenteric bands) or absence of fixation of portions of the bowel increases the risk of bowel obstruction, acute or chronic volvulus, and bowel necrosis. The clinical presentation of patients with malrotation without, with intermittent, or with chronic volvulus can be problematic, with an important minority presenting late or having atypical or chronic symptoms, such as intermittent vomiting, abdominal pain, duodenal obstruction, or failure to thrive...
March 3, 2018: Abdominal Radiology
https://www.readbyqxmd.com/read/29492881/laparoscopic-ultrasound-manipulator-with-a-spring-based-elastic-mechanism
#9
Jumpei Arata, Kazunari Fukami, Susumu Oguri, Shinya Onogi, Tetsuo Ikeda, Ryu Nakadate, Masamichi Sakaguchi, Tomohiko Akahoshi, Kanako Harada, Mamoru Mitsuishi, Makoto Hashizume
PURPOSE: Image guidance is a key technology that can improve the outcome of laparoscopic surgery. However, due to the large deformation caused by digestive organs, a computer-aided navigation system based on preoperative imaging data cannot indicate the correct target position of the lesion (e.g., liver tumors and vessels invisible from the organ surface). To overcome this issue, we developed a laparoscopic ultrasound manipulator with two motorized degrees of freedom at the tip, allowing for the performance of a dexterous ultrasound scan in a confined laparoscopic surgical area...
February 28, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29472086/image-quality-of-four-dimensional-cone-beam-computed-tomography-obtained-at-various-gantry-rotation-speeds-for-liver-stereotactic-body-radiation-therapy-with-fiducial-markers
#10
Yoshinobu Shimohigashi, Fujio Araki, Masato Maruyama, Keisuke Yonemura, Yuji Nakaguchi, Yudai Kai, Ryo Toya
In this study, qualities of 4D cone-beam CT (CBCT) images obtained using various gantry rotation speeds (GRSs) for liver stereotactic body radiation therapy (SBRT) with fiducial markers were quantitatively evaluated. Abdominal phantom containing a fiducial marker was moved along a sinusoidal waveform, and 4D-CBCT images were acquired with GRSs of 50-200° min-1 . We obtained the 4D-CBCT projection data from six patients who underwent liver SBRT and generated 4D-CBCT images at GRSs of 67-200° min-1 , by varying the number of projection data points...
January 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/29414434/fast-elastic-registration-of-soft-tissues-under-large-deformations
#11
Igor Peterlík, Hadrien Courtecuisse, Robert Rohling, Purang Abolmaesumi, Christopher Nguan, Stéphane Cotin, Septimiu Salcudean
A fast and accurate fusion of intra-operative images with a pre-operative data is a key component of computer-aided interventions which aim at improving the outcomes of the intervention while reducing the patient's discomfort. In this paper, we focus on the problematic of the intra-operative navigation during abdominal surgery, which requires an accurate registration of tissues undergoing large deformations. Such a scenario occurs in the case of partial hepatectomy: to facilitate the access to the pathology, e...
April 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29369463/evaluation-of-the-accuracy-and-clinical-practicality-of-a-calculation-system-for-patient-positional-displacement-in-carbon-ion-radiotherapy-at-five-sites
#12
Yoshiki Kubota, Hayato Hayashi, Satoshi Abe, Saki Souda, Ryosuke Okada, Takayoshi Ishii, Mutsumi Tashiro, Masami Torikoshi, Tatsuaki Kanai, Tatsuya Ohno, Takashi Nakano
PURPOSE: We developed a system for calculating patient positional displacement between digital radiography images (DRs) and digitally reconstructed radiography images (DRRs) to reduce patient radiation exposure, minimize individual differences between radiological technologists in patient positioning, and decrease positioning time. The accuracy of this system at five sites was evaluated with clinical data from cancer patients. The dependence of calculation accuracy on the size of the region of interest (ROI) and initial position was evaluated for clinical use...
January 25, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29315083/capture-consistently-acquired-projections-for-tuned-and-robust-estimation-a-self-navigated-respiratory-motion-correction-approach
#13
Cihat Eldeniz, Tyler Fraum, Amber Salter, Yasheng Chen, H Michael Gach, Parag J Parikh, Kathryn J Fowler, Hongyu An
OBJECTIVES: In this study, we present a fully automated and robust self-navigated approach to obtain 4-dimensional (4-D) motion-resolved images during free breathing. MATERIALS AND METHODS: The proposed method, Consistently Acquired Projections for Tuned and Robust Estimation (CAPTURE), is a variant of the stack-of-stars gradient-echo sequence. A 1-D navigator was consistently acquired at a fixed azimuthal angle for all stacks of spokes to reduce nonphysiological signal contamination due to system imperfections...
May 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29239710/liver-fibrosis-deep-convolutional-neural-network-for-staging-by-using-gadoxetic-acid-enhanced-hepatobiliary-phase-mr-images
#14
Koichiro Yasaka, Hiroyuki Akai, Akira Kunimatsu, Osamu Abe, Shigeru Kiryu
Purpose To investigate the performance of a deep convolutional neural network (DCNN) model in the staging of liver fibrosis using gadoxetic acid-enhanced hepatobiliary phase magnetic resonance (MR) imaging. Materials and Methods This retrospective study included patients for whom input data (hepatobiliary phase MR images, static magnetic field of the imaging unit, and hepatitis B and C virus testing results available, either positive or negative) and reference standard data (liver fibrosis stage evaluated from biopsy or surgical specimens obtained within 6 months of the MR examinations) were available were assigned to the training (534 patients) or the test (100 patients) group...
April 2018: Radiology
https://www.readbyqxmd.com/read/29209135/first-case-of-cross-auxiliary-double-domino-donor-liver-transplantation
#15
Zhi-Jun Zhu, Lin Wei, Wei Qu, Li-Ying Sun, Ying Liu, Zhi-Gui Zeng, Liang Zhang, En-Hui He, Hai-Ming Zhang, Ji-Dong Jia, Zhong-Tao Zhang
We report a case of double domino liver transplantation in a 32-year-old woman who was diagnosed with familial amyloid polyneuropathy (FAP) and liver dysfunction. A two-stage surgical plan was designed, and one domino graft was implanted during each stage. During the first stage, an auxiliary domino liver transplantation was conducted using a domino graft from a 4-year-old female child with Wilson's disease. After removing the right lobe of the FAP patient's liver, the graft was rotated 90 degrees counterclockwise and placed along the right side of the inferior vena cava (IVC)...
November 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29188763/prothrombotic-state-in-a-patient-with-acute-liver-failure-the-question-of-anticoagulation
#16
Ecaterina Scărlă Tescu, Dana Rodica Tomescu
A 35-year-old male with acute liver failure due to acute hepatitis B virus infection was admitted to the intensive care unit with significant hepatocellular injury, cholestasis, abnormal standard coagulation tests, normal rotational thromboelastometry indices, and without signs of bleeding. He underwent emergency liver transplantation without requiring blood product transfusions or procoagulant treatments. The postoperative course was complicated by deep vein thrombosis and impending hepatic artery thrombosis treated with unfractionated heparin, aspirin, and intravenous prostacyclin...
November 1, 2017: Seminars in Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29160777/motion-compensation-with-skin-contact-control-for-high-intensity-focused-ultrasound-surgery-in-moving-organs
#17
A Diodato, A Cafarelli, A Schiappacasse, S Tognarelli, G Ciuti, A Menciassi
High intensity focused ultrasound (HIFU) is an emerging therapeutic solution that enables non-invasive treatment of several pathologies, mainly in oncology. On the other hand, accurate targeting of moving abdominal organs (e.g. liver, kidney, pancreas) is still an open challenge. This paper proposes a novel method to compensate the physiological respiratory motion of organs during HIFU procedures, by exploiting a robotic platform for ultrasound-guided HIFU surgery provided with a therapeutic annular phased array transducer...
January 26, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29149719/tissue-specific-bioaccumulation-of-long-chain-perfluorinated-carboxylic-acids-and-halogenated-methylbipyrroles-in-dall-s-porpoises-phocoenoides-dalli-and-harbor-porpoises-phocoena-phocoena-stranded-in-northern-japan
#18
Yukiko Fujii, Yoshihisa Kato, Kentarou Sakamoto, Takashi Matsuishi, Harada H Kouji, Akio Koizumi, Osamu Kimura, Tetsuya Endo, Koichi Haraguchi
This study investigated accumulation of perfluoroalkyl substances (PFASs), persistent organochlorines (OCs), and naturally produced halogenated compounds (NHCs), including brominated methylbipyrroles and methoxylated bromodiphenyl ethers, in liver, blood, and blubber from Dall's porpoises (Phocoenoides dalli) and harbor porpoises (Phocoena phocoena) stranded in Hokkaido, northern Japan. Profiles of the PFASs were dominated by perfluoroundecanoic acid and perfluorotridecanoic acid, both of which accounted for 70% of the total measured PFAS concentrations in both porpoise species...
March 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29145467/adenosine-lidocaine-and-mg2-alm-fluid-therapy-attenuates-systemic-inflammation-platelet-dysfunction-and-coagulopathy-after-non-compressible-truncal-hemorrhage
#19
Hayley Letson, Geoffrey Dobson
BACKGROUND: Systemic inflammation and coagulopathy are major drivers of injury progression following hemorrhagic trauma. Our aim was to examine the effect of small-volume 3% NaCl adenosine, lidocaine and Mg2+ (ALM) bolus and 0.9% NaCl/ALM 'drip' on inflammation and coagulation in a rat model of hemorrhagic shock. METHODS: Sprague-Dawley rats (429±4 g) were randomly assigned to: 1) shams, 2) no-treatment, 3) saline-controls, 4) ALM-therapy, and 5) Hextend®. Hemorrhage was induced in anesthetized-ventilated animals by liver resection (60% left lateral lobe and 50% medial lobe)...
2017: PloS One
https://www.readbyqxmd.com/read/29116741/high-performance-poly-lactic-co-glycolic-acid-magnetic-microspheres-prepared-by-rotating-membrane-emulsification-for-transcatheter-arterial-embolization-and-magnetic-ablation-in-vx-2-liver-tumors
#20
Yi-Jun Liang, Hui Yu, Guodong Feng, Linlin Zhuang, Wei Xi, Ming Ma, Jun Chen, Ning Gu, Yu Zhang
Interventional embolization is a popular minimally invasive vascular therapeutic technique and has been widely applied for hepatocellular carcinoma (HCC) therapy. However, harmful effects caused by transcatheter arterial chemoembolization (TACE) and radioembolization, such as the toxicity of chemotherapy or excessive radiation damage, are serious disadvantages and significantly reduce the therapeutic efficacy. Here, a synergistic therapeutic strategy combined transcatheter arterial embolization and magnetic ablation (TAEMA) by using poly(lactic-co-glycolic acid) (PLGA)-magnetic microspheres (MMs) has been successfully applied to orthotopic VX2 liver tumors of rabbits...
December 20, 2017: ACS Applied Materials & Interfaces
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