Results 41 to 50 of about 18,449 (165)
Computational analysis for competition flows in arteriovenous fistulas based on non-contrast magnetic resonance imaging [PDF]
arXiv, 2023 Introduction: Characteristics of hemodynamics strongly affect the patency of arteriovenous fistula (AVF) in hemodialysis patients. Because of pressure balance changes among arteries after AVF construction, regurgitating flow occurs in some patients.
arxiv
European Journal of Medical Research, 2009 Introduction Rectal polypectomy causes thinning (or even perforation) of the rectal wall in addition to thermic injury at the polypectomy site. Case report We present a rare case of spontaneous rectal perforation after uncomplicated nerve sparing ...
Khoder WY +5 more
doaj +1 more source
Attention Augmented ConvNeXt UNet For Rectal Tumour Segmentation [PDF]
arXiv, 2022 It is a challenge to segment the location and size of rectal cancer tumours through deep learning. In this paper, in order to improve the ability of extracting suffi-cient feature information in rectal tumour segmentation, attention enlarged ConvNeXt UNet (AACN-UNet), is proposed.
arxiv
BMC Surgery, 2020 Background Chronic radiation proctitis (CRP) with rectal ulcer is a common complication after pelvic malignancy radiation, and gradually deteriorating ulcers will result in severe complications such as fistula.
Xiaoyan Huang +9 more
doaj +1 more source
A computational study of viscoelastic blood flow in an arteriovenous fistula [PDF]
arXiv, 2020 A finite element analysis of flows of an Oldroyd-B fluid is developed, to simulate blood flow in an arteriovenous fistula. The model uses a combination of a standard conforming finite element approximation for the momentum equation, and the discontinuous Galerkin method, with upwinding, for the equation governing the evolution of the extra stress.
arxiv
Fluid-structure interaction modelling and stabilisation of a patient-specific arteriovenous access fistula [PDF]
, 2017 A patient-specific fluid-structure interaction (FSI) model of a phase-contrast magnetic resonance angiography (PC-MRA) imaged arteriovenous fistula is presented. The numerical model is developed and simulated using a commercial multiphysics simulation package where a semi-implicit FSI coupling scheme combines a finite volume method blood flow model and
arxiv +1 more source
结直肠肛门外科[Objectives] To investigate the clinical effectiveness of laparoscopic surgical techniques in the treatment of patients with radiation-induced intestinal fistula.
Wang Yue +6 more
doaj +1 more source
Image Synthesis-based Late Stage Cancer Augmentation and Semi-Supervised Segmentation for MRI Rectal Cancer Staging [PDF]
arXiv, 2023 Rectal cancer is one of the most common diseases and a major cause of mortality. For deciding rectal cancer treatment plans, T-staging is important. However, evaluating the index from preoperative MRI images requires high radiologists' skill and experience.
arxiv
Projectile Trajectory of Penguin's Faeces and Rectal Pressure Revisited [PDF]
arXiv, 2020 We discuss a trajectory of penguins' faeces after the powerful shooting due to their strong rectal pressure. Practically, it is important to see how far faeceses reach when penguins expel them from higher places. Such information is useful for keepers to avoid the direct hitting of faeceses.
arxiv
Deep Learning for Needle Detection in a Cannulation Simulator [PDF]
arXiv, 2021 Cannulation for hemodialysis is the act of inserting a needle into a surgically created vascular access (e.g., an arteriovenous fistula) for the purpose of dialysis. The main risk associated with cannulation is infiltration, the puncture of the wall of the vascular access after entry, which can cause medical complications.
arxiv