keyword
https://read.qxmd.com/read/38530384/posterior-cerebral-artery-pca-accessory-pca-hyperplastic-anterior-choroidal-artery-anastomosis-detected-on-magnetic-resonance-angiography
#21
JOURNAL ARTICLE
Akira Uchino, Kazuo Tokushige
PURPOSE: To describe a case of posterior cerebral artery (PCA)-accessory PCA (hyperplastic anterior choroidal artery) anastomosis detected on magnetic resonance angiography. METHODS: A 76-year-old man with a history of cerebral infarction underwent cranial magnetic resonance (MR) imaging and MR angiography of the intracranial region for the evaluation of brain and vascular lesions. The MR machine was a 3-Tesla scanner. MR angiography was performed using a standard three-dimensional time-of-flight technique...
March 26, 2024: Surgical and Radiologic Anatomy: SRA
https://read.qxmd.com/read/38529651/prediction-of-lymphovascular-space-invision-in-endometrial-cancer-based-on-multi-parameter-mri-radiomics-model
#22
JOURNAL ARTICLE
Jin Jun Wang, Xiao Hong Zhang, Xing Hua Guo, Yang Ying, Xiang Wang, Zhong Hua Luan, Wei Qin Lv, Peng Fei Wang
UNLABELLED: <p>Objective: To explore the application value of a combined model based on multi-parameter MRI radiomics and clinical features in preoperative prediction of lymphatic vascular space invasion (LVSI) in endometrial carcinoma (EC). METHODS: This retrospective study collected the clinicopathological and imaging data of 218 patients with EC in Yuncheng Central Hospital from March 2018 to May 2022. The patients were randomly divided into training group (n=152) and validation group (n= 66) according to the ratio of 7: 3...
March 19, 2024: Current medical imaging
https://read.qxmd.com/read/38529359/subtle-white-matter-intensity-changes-on-fluid-attenuated-inversion-recovery-imaging-in-patients-with-ischaemic-stroke
#23
JOURNAL ARTICLE
Pedro Cougo, Heber Colares, João Gabriel Farinhas, Mariana Hämmerle, Pedro Neves, Raquel Bezerra, Alex Balduino, Ona Wu, Octavio M Pontes-Neto
Leukoaraiosis is a neuroimaging marker of small-vessel disease that is characterized by high signal intensity on fluid-attenuated inversion recovery MRI. There is increasing evidence from pathology and neuroimaging suggesting that the structural abnormalities that characterize leukoaraiosis are actually present within regions of normal-appearing white matter, and that the underlying pathophysiology of white matter damage related to small-vessel disease involves blood-brain barrier damage. In this study, we aim to verify whether leukoaraiosis is associated with elevated signal intensity on fluid-attenuated inversion recovery imaging, a marker of brain tissue free-water accumulation, in normal-appearing white matter...
2024: Brain communications
https://read.qxmd.com/read/38529266/phybers-a-package-for-brain-tractography-analysis
#24
JOURNAL ARTICLE
Lazara Liset González Rodríguez, Ignacio Osorio, Alejandro Cofre G, Hernan Hernandez Larzabal, Claudio Román, Cyril Poupon, Jean-François Mangin, Cecilia Hernández, Pamela Guevara
We present a Python library (Phybers) for analyzing brain tractography data. Tractography datasets contain streamlines (also called fibers) composed of 3D points representing the main white matter pathways. Several algorithms have been proposed to analyze this data, including clustering, segmentation, and visualization methods. The manipulation of tractography data is not straightforward due to the geometrical complexity of the streamlines, the file format, and the size of the datasets, which may contain millions of fibers...
2024: Frontiers in Neuroscience
https://read.qxmd.com/read/38528694/automated-detection-and-segmentation-of-bone-metastases-on-spine-mri-using-u-net-a-multicenter-study
#25
MULTICENTER STUDY
Dong Hyun Kim, Jiwoon Seo, Ji Hyun Lee, Eun-Tae Jeon, DongYoung Jeong, Hee Dong Chae, Eugene Lee, Ji Hee Kang, Yoon-Hee Choi, Hyo Jin Kim, Jee Won Chai
OBJECTIVE: To develop and evaluate a deep learning model for automated segmentation and detection of bone metastasis on spinal MRI. MATERIALS AND METHODS: We included whole spine MRI scans of adult patients with bone metastasis: 662 MRI series from 302 patients (63.5 ± 11.5 years; male:female, 151:151) from three study centers obtained between January 2015 and August 2021 for training and internal testing (random split into 536 and 126 series, respectively) and 49 MRI series from 20 patients (65...
April 2024: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://read.qxmd.com/read/38527405/self-supervised-learning-for-medical-image-data-with-anatomy-oriented-imaging-planes
#26
JOURNAL ARTICLE
Tianwei Zhang, Dong Wei, Mengmeng Zhu, Shi Gu, Yefeng Zheng
Self-supervised learning has emerged as a powerful tool for pretraining deep networks on unlabeled data, prior to transfer learning of target tasks with limited annotation. The relevance between the pretraining pretext and target tasks is crucial to the success of transfer learning. Various pretext tasks have been proposed to utilize properties of medical image data (e.g., three dimensionality), which are more relevant to medical image analysis than generic ones for natural images. However, previous work rarely paid attention to data with anatomy-oriented imaging planes, e...
March 21, 2024: Medical Image Analysis
https://read.qxmd.com/read/38527376/joint-reconstruction-and-segmentation-in-undersampled-3d-knee-mri-combining-shape-knowledge-and-deep-learning
#27
JOURNAL ARTICLE
Andreas Kofler, Christian Wald, Christoph Kolbitsch, Christoph Von Tycowicz, Felix Ambellan
Task-adapted image reconstruction methods using end-to-end trainable&#xD;neural networks (NNs) have been proposed to optimize reconstruction for subsequent&#xD;processing tasks, such as segmentation. However, their training typically requires&#xD;considerable hardware resources and thus, only relatively simple building blocks,&#xD;e.g. U-Nets, are typically used, which, albeit powerful, do not integrate model-&#xD;specific knowledge. In this work, we extend an end-to-end trainable task-adapted&#xD;image reconstruction method for a clinically realistic reconstruction and segmentation&#xD;problem of bone and cartilage in 3D knee MRI by incorporating statistical shape models&#xD;(SSMs)...
March 25, 2024: Physics in Medicine and Biology
https://read.qxmd.com/read/38527245/size-and-location-of-preterm-brain-injury-and-associations-with-neurodevelopmental-outcomes
#28
JOURNAL ARTICLE
Thiviya Selvanathan, Ting Guo, Steven Ufkes, Vann Chau, Helen Branson, Anne Synnes, Linh G Ly, Edmond N Kelly, Ruth E Grunau, Steven P Miller
BACKGROUND AND OBJECTIVES: We examined associations of white matter injury (WMI) and periventricular hemorrhagic infarction (PVHI) volume and location with 18-month neurodevelopment in very preterm infants. METHODS: A total of 254 infants born <32 weeks' gestational age were prospectively recruited across 3 tertiary neonatal intensive care units (NICUs). Infants underwent early-life (median 33.1 weeks) and/or term-equivalent-age (median 41.9 weeks) MRI. WMI and PVHI were manually segmented for quantification in 92 infants...
April 23, 2024: Neurology
https://read.qxmd.com/read/38526991/the-usefulness-of-speckle-tracking-echocardiography-for-the-prediction-of-cardiac-involvement-in-patients-with-biopsy-proven-sarcoidosis
#29
JOURNAL ARTICLE
Hanna Jankowska, Karolina Dorniak, Maria Dudziak, Anna Glińska, Katarzyna Sienkiewicz, Dorota Kulawiak-Gałąska, Jadwiga Fijałkowska, Anna Dubaniewicz, Marcin Hellmann
INTRODUCTION: Cardiac sarcoidosis (CS) is commonly diagnosed based on clinical criteria and abnormalities in noninvasive imaging reported in patients with biopsy-proven extracardiac sarcoidosis. Electrocardiogram and two-dimensional echocardiography have a low sensitivity for CS detection. Cardiovascular magnetic resonance imaging (CMR) and positron emission tomography (PET) have limitations in terms of cost and availability. OBJECTIVES: This study aimed to assess the usefulness of left ventricular longitudinal strain, measured using two-dimensional speckle tracking echocardiography (STE), for the prediction of late gadolinium enhancement (LGE) presence in CMR in patients with biopsy-proven sarcoidosis...
March 2024: Echocardiography
https://read.qxmd.com/read/38526330/altered-brain-morphology-and-functional-connectivity-in-postmenopausal-women-automatic-segmentation-of-whole-brain-and-thalamic-subnuclei-and-resting-state-fmri
#30
JOURNAL ARTICLE
Gwang-Won Kim, Kwangsung Park, Yun-Hyeon Kim, Gwang-Woo Jeong
The transition to menopause is associated with various physiological changes, including alterations in brain structure and function. However, menopause-related structural and functional changes are poorly understood. The purpose of this study was not only to compare the brain volume changes between premenopausal and postmenopausal women, but also to evaluate the functional connectivity between the targeted brain regions associated with structural atrophy in postmenopausal women. Each 21 premenopausal and postmenopausal women underwent magnetic resonance imaging (MRI)...
March 23, 2024: Aging
https://read.qxmd.com/read/38526032/quantitative-1-h-magnetic-resonance-imaging-on-normal-and-pathologic-rat-bones-by-solid-state-1-h-zte-sequence-with-water-and-fat-suppression
#31
JOURNAL ARTICLE
Víctor B Kassey, Matthias Walle, Jonathan Egan, Diana Yeritsyan, Indeevar Beeram, Sharon P Kassey, Yaotang Wu, Brian D Snyder, Edward K Rodriguez, Jerome L Ackerman, Ara Nazarian
BACKGROUND: Osteoporosis (OP) and osteomalacia (OM) are metabolic bone diseases characterized by mineral and matrix density changes. Quantitative bone matrix density differentiates OM from OP. MRI is a noninvasive and nonionizing imaging technique that can measure bone matrix density quantitatively in ex vivo and in vivo. PURPOSE: To demonstrate water + fat suppressed 1 H MRI to compute bone matrix density in ex vivo rat femurs in the preclinical model...
March 25, 2024: Journal of Magnetic Resonance Imaging: JMRI
https://read.qxmd.com/read/38525948/high-resolution-free-breathing-automated-quantitative-myocardial-perfusion-by-cardiovascular-magnetic-resonance-for-the-detection-of-functionally-significant-coronary-artery-disease
#32
JOURNAL ARTICLE
R Crawley, K P Kunze, X Milidonis, J Highton, S McElroy, S M Frey, D Hoefler, C Karamanli, N C K Wong, S J Backhaus, E Alskaf, R Neji, C M Scannell, S Plein, A Chiribiri
AIMS: Current assessment of myocardial ischaemia from stress perfusion cardiovascular magnetic resonance (SP-CMR) largely relies on visual interpretation. This study investigated the use of high-resolution free-breathing SP-CMR with automated quantitative mapping in the diagnosis of coronary artery disease (CAD). Diagnostic performance was evaluated against invasive coronary angiography (ICA) with fractional flow reserve (FFR) measurement. METHODS & RESULTS: Seven-hundred and three patients were recruited for SP-CMR using the research sequence at 3 Tesla...
March 25, 2024: European Heart Journal Cardiovascular Imaging
https://read.qxmd.com/read/38525747/diffusion-mri-fiber-tractography-and-benzodiazepine-spect-imaging-for-assessing-neural-damage-to-the-language-centers-in-an-elderly-patient-after-successful-reperfusion-therapy
#33
Tatsushi Mutoh, Yasuyuki Yoshida, Yasuko Tatewaki, Hongkun Chin, Ryota Tochinai, Junta Moroi, Tatsuya Ishikawa
BACKGROUND: Intravenous thrombolysis and mechanical thrombectomy are the first-line reperfusion therapies for acute ischemic stroke. Here, we describe the utility of diffusion magnetic resonance imaging (MRI) fiber tractography and 123 I-iomazenil benzodiazepine receptor single-photon emission computed tomography to estimate the prognosis of post-stroke aphasia after successful reperfusion therapy. CASE REPORT: An 81-year-old man was admitted to the hospital approximately 3...
March 1, 2024: Geriatrics
https://read.qxmd.com/read/38524075/extensive-spinal-hemangioma-associated-with-cutaneous-nevus-in-the-same-metamere-an-unusual-case-of-paraplegia-in-the-peripartum-period
#34
Rogelio D Flores Reyes
Cavernous hemangiomas occur most commonly in the cerebral hemispheres but can involve any part of the neuroaxis, including the spine. Very rare cases of spinal angiomas are associated with a skin lesion in the same metameric segment. This condition, known as segmental neurovascular syndrome or Cobb syndrome, was first described in 1915. We report a rare case of segmental neurovascular syndrome with extensive cervical and thoracic lumbar involvement expressed as peripartum spinal cord compression syndrome. A 37-year-old female with a cutaneous nevus from the C7 dermatome to the L3 dermatome experienced pelvic limb paralysis 48 hours after giving birth to a healthy newborn by cesarean section...
February 2024: Curēus
https://read.qxmd.com/read/38523970/a-case-report-of-bilateral-optic-perineuritis-with-idiopathic-intracranial-hypertension-challenges-in-diagnosis-and-management
#35
Nurul-Farah H Shahrudin, Julieana Muhammed, Wan-Hazabbah Wan Hitam, Nur Asma Sapiai, Sanihah Abdul Halim
Optic perineuritis (OPN) refers to the inflammation of the optic nerve sheath and it is a rare form of idiopathic orbital inflammatory disease. We report a rare case of bilateral OPN in an obese female teenager with idiopathic intracranial hypertension (IIH). She was initially presented with painless bilateral blurring of vision that was progressively worsening for three weeks duration. Visual acuity of both eyes was hand movement with no relative afferent pupillary defect detected. The confrontation visual field test showed central scotoma...
February 2024: Curēus
https://read.qxmd.com/read/38523883/caroli-s-disease-associated-with-autosomal-dominant-polycystic-kidney-disease-with-acute-pancreatitis-a-case-report
#36
Karishma M Rathi, Priyanka Pingat, Prachi Bansode, Shaili Dongare
A rare congenital hepatobiliary disorder called Caroli's disease is characterized by multifocal segmental dilatation of intrahepatic bile ducts that can affect the entire liver or only specific areas of it. Coexisting conditions with Caroli's disease include autosomal dominant polycystic kidney disease (ADPKD) and autosomal recessive polycystic kidney disease (ARPKD). ADPKD results in the development of cysts, which are tiny fluid-filled sacs, in the kidneys. Caroli's disease is considered a rare disorder, affecting a small number of individuals worldwide...
October 2023: Middle East Journal of Digestive Diseases
https://read.qxmd.com/read/38523738/joint-deep-learning-for-improved-myocardial-scar-detection-from-cardiac-mri
#37
JOURNAL ARTICLE
Jiarui Xing, Shuo Wang, Kenneth C Bilchick, Amit R Patel, Miaomiao Zhang
Automated identification of myocardial scar from late gadolinium enhancement cardiac magnetic resonance images (LGE-CMR) is limited by image noise and artifacts such as those related to motion and partial volume effect. This paper presents a novel joint deep learning (JDL) framework that improves such tasks by utilizing simultaneously learned myocardium segmentations to eliminate negative effects from non-region-of-interest areas. In contrast to previous approaches treating scar detection and myocardium segmentation as separate or parallel tasks, our proposed method introduces a message passing module where the information of myocardium segmentation is directly passed to guide scar detectors...
April 2023: Proceedings of the IEEE International Symposium on Biomedical Imaging: from Nano to Macro
https://read.qxmd.com/read/38523651/evaluation-of-features-in-probably-benign-and-malignant-nonmass-enhancement-in-breast-mri
#38
JOURNAL ARTICLE
Nasrin Ahmadinejad, Fahimeh Azizinik, Pershang Khosravi, Ala Torabi, Amirhassan Mohajeri, Arvin Arian
Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is a highly sensitive breast imaging modality in detecting breast carcinoma. Nonmass enhancement (NME) is uniquely seen on MRI of the breast. The correlation between NME features and pathologic results has not been extensively explored. Our goal was to evaluate the characteristics of probably benign and suspicious NME lesions in MRI and determine which features are more associated with malignancy. We performed a retrospective research after approval by the hospital ethics committee on women who underwent breast MRI from March 2017 to March 2020 and identified 63 lesions of all 400 NME that were categorized as probably benign or suspicious according to the BI-RADS classification (version 2013)...
2024: International Journal of Breast Cancer
https://read.qxmd.com/read/38523521/deep-learning-based-thigh-muscle-investigation-using-mri-for-prosthetic-development-for-patients-undergoing-total-knee-replacement-tkr
#39
JOURNAL ARTICLE
Vinod Arunachalam, Kumareshan N
BACKGROUND: A prosthetic device is designed based on the quantitative analysis of muscle MRI which will improve the muscle control achieved with functional electrical stimulation/ guided robotic exoskeletons. Electromyography (EMG) provides muscle functionality information while MRI provides the physiological and functionality of muscles. The sensor feedbacks were used for the bionic prosthesis, but the length of muscle using image processing was not correlated. OBJECTIVE: To investigate and perform qualitative and quantitative assessment of thigh muscle using MRI...
March 22, 2024: Current medical imaging
https://read.qxmd.com/read/38523402/a-review-of-self-supervised-generative-and-few-shot-deep-learning-methods-for-data-limited-magnetic-resonance-imaging-segmentation
#40
REVIEW
Zelong Liu, Komal Kainth, Alexander Zhou, Timothy W Deyer, Zahi A Fayad, Hayit Greenspan, Xueyan Mei
Magnetic resonance imaging (MRI) is a ubiquitous medical imaging technology with applications in disease diagnostics, intervention, and treatment planning. Accurate MRI segmentation is critical for diagnosing abnormalities, monitoring diseases, and deciding on a course of treatment. With the advent of advanced deep learning frameworks, fully automated and accurate MRI segmentation is advancing. Traditional supervised deep learning techniques have advanced tremendously, reaching clinical-level accuracy in the field of segmentation...
March 24, 2024: NMR in Biomedicine
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