Variations of transverse foramens of cervical vertebrae: a 3-dimensional multidetector CT study

Purpose . Whole-heart magnetic resonance coronary angiography (WH-MRCA) has been recently proposed for non-invasive coronary imaging. Early studies have suggested that WH-MRCA might have similarly high diagnostic accuracy for detection of coronary disease as multidetector CT (MDCT). Yet, no direct comparison between both techniques has been performed. The aim of the present study was therefore to perform a head-to-head comparison of both techniques for detection of significant coronary stenoses using invasive cardiac catheterization as reference standard. Methods. Seventy-seven consecutive patients (56 M, 61±14 years) prospectively underwent free-breathing 3-dimensional WH-MRCA and 40/64-slice MDCT before cardiac catheterization. WH-MRCA and MDCT images were visually graded by 2 blinded observers and the diagnostic accuracy of both methods for detecting >50% luminal diameter stenoses (DS) in segments and vessels >1.5 mm size was compared using quantitative angiography (QCA) as reference method. Results. MDCT was successfully completed in all 77 patients in < 5 minutes. By contrast, WH-MRCA failed in 9 patients (12%) because of poor navigator performance and lasted 20±4 minutes (p<.01 vs MDCT). According to QCA, out of 992 segments > 1.5 mm diameter, 49 presented >50% DS. If all segments including non interpretable segments were considered, WH-MRCA had lower sensibility (35/49 or 71% vs. 45/49 or 92%, p<0.001), lower specificity (644/943 or 68% vs. 863/943 or 92%, p<0.001) and accuracy (679/992 or 68% vs. 908/992 or 92%, p<0.001) for detection of coronary stenosis than MDCT. However if only interpretable segments were considered, the sensitivity (35/37 or 95% vs. 45/46 or 98%, p=0.58), specificity (644/689 or 93% vs. 863/917 or 94%, p=0.67) and diagnostic accuracy (679/726 or 94%, vs. 908/963 or 94%, p=0.58) of WH-MRCA and MDCT for detection of >50% DS was similar. This was also the case on per-vessel basis. Conclusion. In the present study, MDCT had higher success rate than WH-MRCA. Therefore on an intention to diagnose basis, MDCT was superior to WH-MRCA. However, the diagnostic accuracy of WH-MRCA on per-segment and per-vessel basis was not statistically different from MDCT if only interpretable segments were considered.

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Postprocessing in Maxillofacial Multidetector Computed Tomography

Canadian Association of Radiologists Journal ◽

10.1016/j.carj.2014.12.004 ◽

2015 ◽

Vol 66 (3) ◽

pp. 212-222 ◽

Cited By ~ 7

Author(s):

Silvio Mazziotti ◽

Alfredo Blandino ◽

Michele Gaeta ◽

Antonio Bottari ◽

Carmelo Sofia ◽

...

Keyword(s):

Computed Tomography ◽

Multidetector Computed Tomography ◽

Multidetector Ct ◽

Surface Display ◽

Maximum Intensity Projection ◽

Longitudinal Axis ◽

Theoretical Assumption ◽

3 Dimensional ◽

Volumetric Rendering ◽

Rendering Techniques

Multidetector computed tomography (CT) and volumetric rendering techniques have always been a useful support for the anatomical and pathological study of the maxillofacial district. Nowadays accessibility to multidetector CT scanners allows the achievement of images with an extremely thin collimation and with high spatial resolution, not only along the axial plane but also along the patient's longitudinal axis. This feature is the main theoretical assumption for multiplanar imaging and for an optimal 3-dimensional postprocessing. Multiplanar reconstruction (MPR) techniques permit images along any plane in the space to be obtained, including curved planes; this feature allows the representation in a single bidimensional image of different anatomical structures that develop on multiple planes. For this reason MPR techniques represent an unavoidable step for the study of traumatic pathology as well as of malformative, neoplastic, and inflammatory pathologies. Among 3-dimensional techniques, Maximum Intensity Projection and Shaded Surface Display are routinely used in clinical practice. In addition, volumetric rendering techniques allow a better efficacy in representing the different tissues of maxillofacial district. Each of these techniques give the radiologist an undoubted support for the diagnosis and the characterization of traumatic and malformative conditions, have a critical utility in the neoplastic evaluation of primary or secondary bone involvement, and are also used in the planning of the most modern radiosurgical treatments. The aim of this article is to define the main technical aspects of imaging postprocessing in maxillofacial CT and to summarize when each technique is indicated, according to the different pathologies of this complex anatomical district.

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Successful preoperative identification of fish bone causing appendicitis using 3-dimensional multidetector-CT

Radiology Case Reports ◽

10.1016/j.radcr.2021.11.043 ◽

2022 ◽

Vol 17 (3) ◽

pp. 577-580

Author(s):

Souji Sane ◽

Yasuhiko Fujita ◽

Teruyoshi Amagai

Keyword(s):

Multidetector Ct ◽

Fish Bone ◽

3 Dimensional

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Pitfalls in the Detection of Intracranial Aneurysms With 3-Dimensional 64-Multidetector CT Angiography

Contemporary Diagnostic Radiology ◽

10.1097/01.cdr.0000417954.27953.cb ◽

2012 ◽

Vol 35 (16) ◽

pp. 1-6

Author(s):

Roy Riascos ◽

Raghuram Rao ◽

Fuad Makkouk ◽

Tomas Uribe

Keyword(s):

Ct Angiography ◽

Intracranial Aneurysms ◽

Multidetector Ct ◽

3 Dimensional ◽

Multidetector Ct Angiography

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Three-Dimensional Reconstruction Using Stereo Pairs from Serial Thick Sections

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100080249 ◽

1977 ◽

Vol 35 ◽

pp. 562-563

Author(s):

Robert Glaeser ◽

Thomas Bauer ◽

David Grano

Keyword(s):

Three Dimensional ◽

Dimensional Structure ◽

Serial Sections ◽

Thin Sections ◽

3 Dimensional ◽

Transmission Electron ◽

Freeze Dried ◽

Dimensional Reconstruction ◽

Stereo Imagery ◽

Whole Mounts

In transmission electron microscopy, the 3-dimensional structure of an object is usually obtained in one of two ways. For objects which can be included in one specimen, as for example with elements included in freeze- dried whole mounts and examined with a high voltage microscope, stereo pairs can be obtained which exhibit the 3-D structure of the element. For objects which can not be included in one specimen, the 3-D shape is obtained by reconstruction from serial sections. However, without stereo imagery, only detail which remains constant within the thickness of the section can be used in the reconstruction; consequently, the choice is between a low resolution reconstruction using a few thick sections and a better resolution reconstruction using many thin sections, generally a tedious chore. This paper describes an approach to 3-D reconstruction which uses stereo images of serial thick sections to reconstruct an object including detail which changes within the depth of an individual thick section.

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Structural preservation and absolute contrast of catalase crystal sections prepared with tannic acid

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010007597x ◽

1983 ◽

Vol 41 ◽

pp. 448-449

Author(s):

C.W. Akey ◽

M. Szalay ◽

S.J. Edelstein

Keyword(s):

Tannic Acid ◽

Beef Heart ◽

X Rays ◽

Screw Axis ◽

General Applicability ◽

Thin Sections ◽

Beef Liver ◽

3 Dimensional ◽

Dimensional Reconstruction ◽

Structural Preservation

Three methods of obtaining 20 Å resolution in sectioned protein crystals have recently been described. They include tannic acid fixation, low temperature embedding and grid sectioning. To be useful for 3-dimensional reconstruction thin sections must possess suitable resolution, structural fidelity and a known contrast. Tannic acid fixation appears to satisfy the above criteria based on studies of crystals of Pseudomonas cytochrome oxidase, orthorhombic beef liver catalase and beef heart F1-ATPase. In order to develop methods with general applicability, we have concentrated our efforts on a trigonal modification of catalase which routinely demonstrated a resolution of 40 Å. The catalase system is particularly useful since a comparison with the structure recently solved with x-rays will permit evaluation of the accuracy of 3-D reconstructions of sectioned crystals.Initially, we re-evaluated the packing of trigonal catalase crystals studied by Longley. Images of the (001) plane are of particular interest since they give a projection down the 31-screw axis in space group P3121. Images obtained by the method of Longley or by tannic acid fixation are negatively contrasted since control experiments with orthorhombic catalase plates yield negatively stained specimens with conditions used for the larger trigonal crystals.

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Deviations from Ideal Decagonal Symmetry in Electron Diffraction Patterns of the “Decagonal” Phase in the Al-Co-Cu Alloy System

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100088889 ◽

1991 ◽

Vol 49 ◽

pp. 914-915

Author(s):

Atul S. Ramani ◽

Earle R. Ryba ◽

Paul R. Howell

Keyword(s):

Electron Microscope ◽

Alloy System ◽

Nominal Composition ◽

Dimensional Lattice ◽

3 Dimensional ◽

Decagonal Phase ◽

Cu Alloy ◽

Transmission Electron ◽

Lattice Periodicity ◽

Diffraction Patterns

The “decagonal” phase in the Al-Co-Cu system of nominal composition Al65CO15Cu20 first discovered by He et al. is especially suitable as a topic of investigation since it has been claimed that it is thermodynamically stable and is reported to be periodic in the dimension perpendicular to the plane of quasiperiodic 10-fold symmetry. It can thus be expected that it is an important link between fully periodic and fully quasiperiodic phases. In the present paper, we report important findings of our transmission electron microscope (TEM) study that concern deviations from ideal decagonal symmetry of selected area diffraction patterns (SADPs) obtained from several “decagonal” phase crystals and also observation of a lattice of main reflections on the 10-fold and 2-fold SADPs that implies complete 3-dimensional lattice periodicity and the fundamentally incommensurate nature of the “decagonal” phase. We also present diffraction evidence for a new transition phase that can be classified as being one-dimensionally quasiperiodic if the lattice of main reflections is ignored.

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