We devised a method to allow for retrospective registration of tomographic images with very different information content, the main emphasis being on sets of positron emission tomography images obtained with different tracers. A multivariate cost-function based on information theory was used as an index of "goodness-of-alignment". The cost-function makes no assumptions regarding the form of the relationship between the two image sets, and is hence very general. Image volumes, with known relative spatial orientation, were simulated for tracers with different uptake patterns and the method was validated by assessing its ability to recover these known orientations. The method was able to recover the known transformations with an accuracy of about 1 mm and 1 degrees along and around all axes, even for tracer combinations with radically different uptake patterns and with large initial misalignment. With the suggested method it is feasible to retrospectively align examinations obtained with different tracers and/or modalities.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s002590050443 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Tomographic and 3-dimensional imaging of the larger recurved caniniform teeth on the jawbone of Caprodon schlegelii.
J Oral Sci
January 2025
Department of Anatomy, Nihon University School of Dentistry.
Purpose: This study aimed to characterize the 3-dimensional morphology of larger recurved caniniform teeth (LrCTs) and their underlying intraosseous structures in Caprodon schlegelii.
Methods: Specimens (n = 5) with a total length of approximately 32 cm were fixed and processed for micro-computed tomography and/or stereomicroscopy. Volume data of the LrCT-bearing jaws were examined using volume rendering images.
Development of a model for detection and analysis of inclusions in tomographic images of iron castings using decision trees.
Sci Rep
January 2025
Department of Applied Computer Science and Modelling Department, Faculty of Metals Engineering and Industrial Computer Science, AGH University of Krakow, Czarnowiejska 66, 30-054, Krakow, Poland.
CT images of castings made of ductile iron were analyzed in the paper. On these images, objects can be identified that can be considered as graphite precipitates or indicate the presence of a defect in the casting. Research conducted in this area is described, based on experimental data that allows to determine whether the indicated components present in the casting are graphite precipitation.
View Article and Find Full Text PDFSex disparities in the risk of intracranial aneurysm rupture: a case-control study.
Front Neurol
December 2024
Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, China.
Background: There are sex disparities in the risk of ruptured intracranial aneurysm (IA), but which sex-specific factors are related to ruptured IA remains inconclusive.
Methods: Data from electronic medical records from two tertiary hospitals, collected between January 2012 and December 2019, were analyzed for this study. All IAs were confirmed by computed tomographic angiography or digital subtraction angiography.
Unilateral temporomandibular joint disorders diagnosed as both disc displacement without reduction and osteoarthritis show vertical craniofacial asymmetry in women.
J Oral Facial Pain Headache
September 2024
Department of Orofacial Pain and Oral Medicine, Yonsei University College of Dentistry, 03722 Seoul, Republic of Korea.
This study investigated the effects of unilateral temporomandibular joint disorders (TMJDs), specifically disc displacement without reduction and osteoarthritis on one side of the temporomandibular joint (TMJ), on facial asymmetry in women, while the contralateral TMJ exhibits normal findings. Participants were retrospectively enrolled and divided into an affected group (n = 42 with unilateral TMJD) and a control group (n = 49 with bilateral healthy TMJs). The affected group was dagnosed with osteoarthritis on cone-bema computed tomograph and anterior disk displacement without reduction on magnetic resonance imaging.
View Article and Find Full Text PDF5-FU Weakens Defensive Functions of the Junctional Epithelium.
J Periodontal Res
January 2025
Department of Surgery, Stanford University School of Medicine, Stanford, California, USA.
Aim: To investigate additional factors contributing to the pathophysiology of chemotherapy-induced oral mucositis and periodontitis beyond the systemic immune suppression caused by the chemotherapeutic agent 5-Fluorouracil (5-FU).
Methods: 5-Fluorouracil was topically delivered to the non-keratinized, rapidly proliferating junctional epithelium (JE) surrounding the dentition, and acts as an immunologic and functional barrier to bacterial ingression. Various techniques, including EdU incorporation, quantitative immunohistochemistry (qIHC), histology, enzymatic activity assays, and micro-computed tomographic (μCT) imaging, were employed to analyze the JE at multiple time points following topical 5-FU treatment.
Want 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!