No abstract available.
Coronary Vessels ; Multidetector Computed Tomography ; Sinus of Valsalva

The mesiobuccal root of the maxillary molars is well known to pose a hindrance during endodontic therapy. Presented here is a case of a maxillary left second molar where three canals were located in its mesiobuccal root with the use of visual and diagnostic aids. Difficulties encountered during the process of unveiling the tooth's internal anatomy were discussed. The dilemmas encountered pertained to the root canal configuration, the nomenclature of the extra canals, and the justification for the presence of a third canal. The root canal configuration of 3-2-1 was confirmed for the mesiobuccal root using information gained from clinical, radiographic, and multi-detector computed tomography (MDCT) scan findings. This case demonstrates the need for efforts to locate extra canals in the mesiobuccal root of the maxillary molars as their internal anatomy remains a mystery.
Dental Pulp Cavity ; Molar ; Multidetector Computed Tomography

Small bowel obstruction is a relatively common clinical condition and its diagnosis is based on the clinical signs, the patient's history and the radiologic findings. For a patient with suspected small bowel obstruction, it is essential to determine the site, location and cause of obstruction for the appropriate management. Because of the poor accuracy of plain radiography, computed tomography (CT) now has an essential role to diagnose bowel obstruction. With the recent evolution of conventional CT into multi-detector computed tomography (MDCT), it is possible to obtain cross sectional images with high spatial resolution and different post-processes can be done, such as obtaining the volume rendering (VR), maximum intensity projection (MIP), or multiplanar reformatted (MPR) images from the volume data. In this article, we illustrate and discuss the utility of the multiplanar images of MDCT for diagnosing the sites, causes and complications of small bowel obstruction.
Humans ; Imaging, Three-Dimensional ; Multidetector Computed Tomography

We present an unusual case of a delayed right ventricular perforation by a single standard-caliber implantable cardioverter-defibrillator lead, which manifested 14 days after implantation. Multidetector computed tomography could clearly display the lead perforation, and allow for identification of the associated sequelae such as pericardial effusion and planning the lead extraction strategy.
Defibrillators, Implantable ; Multidetector Computed Tomography ; Pericardial Effusion

No abstract available.
Angiography* ; Glomus Tumor* ; Multidetector Computed Tomography*

Multidetector-row computed tomography (MDCT) provides new opportunities and poses challenges for medical imaging to radiologists and physicians. Isotropic imaging (similar resolution in three dimensional directions) allows in-depth views of anatomy and disease. Ultra-fast scan enables whole-body volume imaging within a single breath hold and thus the reduction of contrast medium consumption. CT volume data sets can be used for threedimensional visualization of the whole body, with which the detailed and comprehensive interpretation of thoracic anatomy and specific disease location and extent is plausible. Moreover, four-dimensional CT imaging can be possible and therefore, we can observe and quantify cardiopulmonary functions without invasive procedures. The author reviews briefly the application of MDCT for the thoracic imaging.
Dataset ; Diagnostic Imaging ; Four-Dimensional Computed Tomography ; Multidetector Computed Tomography

BACKGROUND: During the planning of a thoracodorsal artery perforator (TDAP) free flap, preoperative multidetector-row computed tomographic (MDCT) angiography is valuable for predicting the locations of perforators. However, CT-based perforator mapping of the thoracodorsal artery is not easy because of its small diameter. Thus, we evaluated 1-mm-thick MDCT images in multiple planes to search for reliable perforators accurately. METHODS: Between July 2010 and October 2011, 19 consecutive patients (13 males, 6 females) who underwent MDCT prior to TDAP free flap operations were enrolled in this study. Patients ranged in age from 10 to 75 years (mean, 39.3 years). MDCT images were acquired at a thickness of 1 mm in the axial, coronal, and sagittal planes. RESULTS: The thoracodorsal artery perforators were detected in all 19 cases. The reliable perforators originating from the descending branch were found in 14 cases, of which 6 had transverse branches. The former were well identified in the coronal view, and the latter in the axial view. The location of the most reliable perforators on MDCT images corresponded well with the surgical findings. CONCLUSIONS: Though MDCT has been widely used in performing the abdominal perforator free flap for detecting reliable perforating vessels, it is not popular in the TDAP free flap. The results of this study suggest that multiple planes of MDCT may increase the probability of detecting the most reliable perforators, along with decreasing the probability of missing available vessels.
Angiography ; Arteries ; Free Tissue Flaps ; Humans ; Male ; Multidetector Computed Tomography

BACKGROUND/AIMS: Common bile duct stones are associated with the extent of dilation of the common bile duct as well as its angulation. Multidetector computed tomography (MD CT) has a good resolution for the definition of the anatomical features of the common bile duct. METHODS: The multiplanar reformation images of 398 patients that underwent multidetector CT for the diagnosis of disorders not related to the bile duct were examined. The diameter and angulation were categorized by gender and age. RESULTS: The average diameter and angulation of the common bile duct was 6.7 mm and 132.6degrees. There was a statistically significant correlation between age and the common bile duct diameter. The Pearson correlation analysis for age and diameter resulted in a value of 0.415 (p<0.001). And the common bile duct (CBD) diameter in people older than 51 years of age showed a significant difference compared to the subjects younger than 50 years of age (p<0.01). However, the degree of angulation has no correlation with age. CONCLUSIONS: We suggest that CBD diameters in patients more than 50 years of age can be more than 7 mm and be within normal limits.
Bile Ducts ; Common Bile Duct ; Humans ; Multidetector Computed Tomography

Aneurysms arising from the ophthalmic artery itself are very rare compared with aneurysms originating from the bifurcation of the ophthalmic artery and carotid artery. There was only one reported case of a ruptured aneurysm of the ophthalmic artery itself. We discuss clinical significance of an aneurysm at this site, as well as the role of three dimentional image of multislice computed tomography angiogram(3D-image of MCTA) in determining the cause of subarachnoid hemorrhage(SAH).
Aneurysm ; Aneurysm, Ruptured* ; Carotid Arteries ; Multidetector Computed Tomography ; Ophthalmic Artery*

BACKGROUND AND OBJECTIVES: The aim of this study was to assess mechanical valve function using 64-slice multidetector computed tomography (MDCT). SUBJECTS AND METHODS: In 20 patients (mean age, 50+/-12 years; male-to-female ratio, 10:10), 30 St. Jude bileaflet mechanical valves (15 aortic and 15 mitral valves) were evaluated using MDCT. We selected images vertical and parallel to the mechanical valve. The valve orifice area (OA) and valve length were determined by manual tracing and the opening and closing angles were measured using a protractor. The OA and length of the mechanical valves were compared with the manufacturer's values. RESULTS: The geometric orifice areas (GOAs) based on the manufacturer's values and the OAs determined by MDCT were 3.4+/-0.2 cm2 and 3.4+/-0.3 cm2 for the mitral valves and 2.1+/-0.3 cm2 and 2.1+/-0.4 cm2 for the aortic valves, respectively. The correlation coefficients between the OA measures were 0.433 for the mitral valves and 0.874 for the aortic valves (both p<0.001). The lengths based on the manufacturer's values and determined by MDCT were 29.3+/-1.99 mm and 29.6+/-1.65 mm for the mitral valves and 21.5+/-2.1 mm and 20.7+/-2.3 mm for the aortic valves, respectively. The correlation coefficients between the measures were 0.651 for the mitral valve and 0.846 for the aortic valve (both p<0.001). The opening and closing angles determined by MDCT were 10.9+/-0.6degrees and 131.1+/-3.2degrees for the mitral valves and 11.1+/-0.9degrees and 120.6+/-1.7degrees for the aortic valves, respectively. CONCLUSION: MDCT is an accurate modality with which to assess the function and morphology of bileaflet mechanical valves.
Aortic Valve ; Heart ; Humans ; Mitral Valve ; Multidetector Computed Tomography