A four-dimensional deformable motion algorithm is described for use in the motion compensation of gated cardiac positron emission tomography. The algorithm makes use of temporal continuity and a non-uniform elastic material model to provide improved estimates of heart motion between time frames. Temporal continuity is utilized in two ways. First, incremental motion fields between adjacent time frames are calculated to improve estimation of long-range motion between distant time frames. Second, a consistency criterion is used to insure that the image match between distant time frames is consistent with the deformations used to match adjacent time frames. The consistency requirement augments the algorithm's ability to estimate motion between noisy time frames, and the concatenated incremental motion fields improve estimation for large deformations. The estimated motion fields are used to establish a voxel correspondence between volumes and to produce a motion-compensated composite volume.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s1361-8415(01)00050-0 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Preoperative MRI to Predict Upstaging of DCIS to Invasive Cancer at Surgery.
Ann Surg Oncol
January 2025
Department of Radiology, University of Washington, Seattle, WA, USA.
Background: Ductal carcinoma in situ (DCIS) is overtreated, in part because of inability to predict which DCIS cases diagnosed at core needle biopsy (CNB) will be upstaged at excision. This study aimed to determine whether quantitative magnetic resonance imaging (MRI) features can identify DCIS at risk of upstaging to invasive cancer.
Methods: This prospective observational clinical trial analyzed women with a diagnosis of DCIS on CNB.
Box-Behnken Based Furosemide-Nanostructured Lipid Carriers (NLCs) Delivery System for Improving Oral Bioavailability.
Drug Dev Ind Pharm
January 2025
Department of Pharmacy, Quaid-i-Azam University, Islamabad 44000, Pakistan.
Objective: The fabrication of furosemide (FSM) with enhanced oral bioavailability and encapsulation was achieved using a nanostructured lipid carriers (NLCs) drug delivery system.: The uniform drug distribution is a barrier due to its low dose. The lipid-based delivery system was selected based on its poor solubility and permeability, limiting its poor partitioning and solubility in water-based polymeric delivery systems.
View Article and Find Full Text PDFInterrupted versus uninterrupted anticoagulation for cardiac rhythm management device insertion.
Cochrane Database Syst Rev
January 2025
Department of Pharmacy Practice, University of Connecticut, Storrs, CT 06269, USA.
Background: Guideline-recommended strategies to interrupt chronic anticoagulation with warfarin or direct oral anticoagulants (DOAC) during the perioperative period of cardiac implantable electronic device (CIED) surgery differ worldwide. There is uncertainty concerning the benefits and harms of interrupted and uninterrupted anticoagulation in patients undergoing CIED surgery.
Objectives: To assess the benefits and harms of interrupted anticoagulation (IAC) with either warfarin or DOAC in the perioperative period of CIED surgery versus uninterrupted anticoagulation (UAC), with or without heparin bridging, during an equivalent time frame, for CIED surgery.
Subventricular Accumulation of Cu in the Aging Mouse Brain Does Not Associate with Anticipated Increases in Markers of Oxidative Stress.
ACS Chem Neurosci
January 2025
School of Molecular and Life Sciences, Faculty of Science and Engineering, Curtin University, Bentley, WA 6845, Australia.
Natural aging is associated with mild memory loss and cognitive decline, and age is the greatest risk factor for neurodegenerative diseases, such as Alzheimer's disease. There is substantial evidence that oxidative stress is a major contributor to both natural aging and neurodegenerative disease, and coincidently, levels of redox active metals such as Fe and Cu are known to be elevated later in life. Recently, a pronounced age-related increase in Cu content has been reported to occur in mice and rats around a vital regulatory brain region, the subventricular zone of lateral ventricles.
View Article and Find Full Text PDFVitamin D deficiency presenting as seizures.
Med J Armed Forces India
January 2024
Professor & Head, Department of Internal Medicine, Armed Forces Medical College, Pune, India.
Vitamin D deficiency is commonly seen in the general population, likely due to lack of adequate exposure to sunlight as well as lack of sufficient dietary intake. However, severe hypocalcemia secondary to vitamin D deficiency, manifesting as seizures is uncommon. We present a series of such cases encountered by us in the time frame of June 2020 to Dec 2021 (the first wave of the Covid-19 pandemic associated with a lockdown) during which patients of varying age groups presented with seizures.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!