scholarly journals The Possibilities of Multislice computed Tomography in nasal Anthropometry

2019 ◽  
Vol 3 (6) ◽  
pp. 121-125
Author(s):  
D. A. Lezhnev ◽  
D. V. Davydov ◽  
M. O. Dutova
Keyword(s):  
Computed Tomography ◽  
Multislice Computed Tomography ◽  
Imaging Method ◽  
Short Nose ◽  
Preoperative Stage ◽  
Nasal Anatomy ◽  
Normal Configuration ◽  
The Mean ◽  
Long Nose

Background. Nasal anthropometry is an important aspect of maxillofacial and plastic surgery especially in the preoperative stage of rhinoplasty. Multislice computed tomography (MSCT) permits to assess quantitative the variant nasal anatomy using measuring.Aims: to determine the possibilities of MSCT-anthropometry in nasal configuration grade.Materials and methods. We performed a proand retrospective analysis of MSCT data of maxillofacial region of 50 patients (aged 35 ± 10.7 years old) with changes of nasal height and width and 35 women (32.9 ± 8.4 years old) with normal nasal configuration. The variant anatomy consists in long nose (n = 16), short nose (n = 17), wide nose (n = 17). The nasal height was measured from the nasal root (nasion) to the nasal base (subnasion), the nasal width is the distance between the most lateral aspects of the alae nasi. Besides, the nasal index was calculated. The descriptive statistics of obtained data were presented by mean and standard deviation (SD), also the multiple regression analysis was used. Values of p = 0.005 were considered statistically significant.Results. The results showed that the average nasal height in patients with normal configuration is 51.9 ± 2.63 mm, with short nose – 45.2 ± 1.36 mm, with long nose – 60.3 ± 1.28 mm. The mean nasal widths are 34.9 ± 1.88 mm in normal configuration, 38.8±3.57 in wide nose. The nasal indexes were calculated, their features were detected. These obtained results correlate with anthropometric data of different studies.Conclusions. MSCT-anthropometry is an objective imaging method of variant nasal anatomy that could provide improving quality of diagnostics of patients seeking rhinoplasty and choose a surgical approach.

Dose and Image Quality of Cone-Beam Computed Tomography as Compared With Conventional Multislice Computed Tomography in Abdominal Imaging

2014 ◽  
Vol 49 (10) ◽  
pp. 675-684 ◽  
Author(s):  
Alexander A. Schegerer ◽  
Ursula Lechel ◽  
Manuel Ritter ◽  
Gerald Weisser ◽  
Christian Fink ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Cone Beam Computed Tomography ◽  
Multislice Computed Tomography ◽  
Abdominal Imaging ◽  
Cone Beam

scholarly journals Image quality of 16-slice computed tomography coronary angiography in patients with complete left bundle branch block

Medicina ◽  
2008 ◽  
Vol 45 (1) ◽  
pp. 14
Author(s):  
Antanas Jankauskas ◽  
Jurgita Zaveckienė ◽  
Gabija Pundziūtė ◽  
Rimvydas Šlapikas ◽  
Algidas Basevičius ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Heart Rate ◽  
Image Quality ◽  
Coronary Angiography ◽  
Left Bundle Branch Block ◽  
Multislice Computed Tomography ◽  
Quality Score ◽  
Control Group ◽  
Bundle Branch Block

Objective. Noninvasive diagnosis of coronary artery disease in patients with left bundle branch block is challenging. Multislice computed tomography can be useful in this population; however, quality of images depends on the patterns of myocardial contractions. We investigated the influence of left bundle branch block on image quality of multislice computed tomography coronary angiography. Materials and methods. Multislice computed tomography coronary angiography was performed in 30 patients with left bundle branch block and 30 patients without conduction disturbances. Image quality of each coronary segment was visually assessed and rated on a five-point scale (1=highest quality). Results. Average image quality score in the best cardiac cycle phase did not differ significantly between groups (1.71±0.59 in the left bundle branch block group vs. 1.60±0.57 in the control group, P=0.46). In the left bundle branch block group, a significantly lower image quality score was observed in end-systolic cardiac phase (2.67±0.6 vs. 2.22±0.65 in the control group, P=0.007), whereas no difference was demonstrated in mid-diastolic phase (1.73±0.6 vs. 1.69±0.66 in the control group, P=0.81). After image assessment in multiple cardiac phases, an increase in image quality score was higher in the left bundle branch block than in the control group (0.2±0.17 vs. 0.11±0.14, P=0.003). A negative correlation was observed between image quality score and both the heart rate and heart rate variability in both groups (P<0.001). Conclusion. A nonsignificantly lower overall image quality of multislice computed tomography coronary angiography was demonstrated in the left bundle branch block group. In the presence of left bundle branch block, image quality in the end-systolic phase was significantly lower. Image assessment in multiple phases increased overall image quality and is therefore advisable in patients with left bundle branch block. Increased heart rate and heart rate variability worsened image quality in both groups.

Abstract 2796: Coronary Plaque Classification by Multislice Computed Tomography in Comparison with Histopathological Examination of the Atheromatous Tissue Obtained by Directional Coronary Atherectomy

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Shigeki Kimura ◽  
Tsunekazu Kakuta ◽  
Taishi Yonetsu ◽  
Asami Suzuki ◽  
Yuki Komatsu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Multislice Computed Tomography ◽  
Coronary Plaque ◽  
Plaque Morphology ◽  
Fibrous Plaque ◽  
Cutoff Value ◽  
Cutoff Values ◽  
Significant Difference ◽  
The Mean ◽  
Directional Coronary Atherectomy

Multislice computed tomography (MSCT) has been reported to characterize plaque morphology using intracoronary ultrasound (ICUS) findings as the reference. However, the histopathological assessment for the efficacy of MSCT to distinguish atherosclerotic coronary plaque components has not been performed in vivo. We sought to find the cutoff values of CT density (CTD) to classify the non-calcified plaques using histopathological findings as the standard of reference. Thirty nine target lesions treated by directional coronary atherectomy (DCA) in 39 patients with coronary artery disease, who underwent preintervention MSCT and ICUS, were investigated. The lesions with calcifications in MSCT were excluded. DCA samples of plaques were histopathologically classified into one of the two types; lipid rich plaque (L) or fibrous plaque (F), and further, these two plaque types were subdivided into each two groups, plaque with calcifications or without (L-C, L-NC, F-C, F-NC). The mean CTD was determined by ROI method (5 ROIs) from three cross-sections of each target lesion. We compared the mean CTD among the groups and determined the best cutoff values to differentiate plaque compositions by receiver operating characteristic (ROC) curve. Sixteen lesions were histopathologically classified as lipid rich (6 with calcification (L-C), 10 without (L-NC)) and 23 lesions as fibrous plaque (11: F-C, 12: F-NC). Although mean CTD was not significantly different among the groups (L-C: 73±28 HU, L-NC: 39±11, F-C: 87±15, F-NC: 70±12, p=0.09), there was a significant difference between L-NC and F-NC (p<0.01). ROC analysis revealed that the best cutoff value to differentiate L from F showed relatively low sensitivity (cutoff value 52HU, sensitivity 69%, specificity 96%, AUC 0.82), whereas very high sensitivity and specificity (cutoff value 44 HU, sensitivity 90%, specificity 100%, AUC 0.97) was detected for the cutoff value to differentiate L-NC from F-NC. Plaque CTD may accurately classify non-calcified plaque compositions comparable to histopathological definitions when the lesions were composed without microscopic calcifications.

scholarly journals ANATOMICAL VARIANTS OF PYRIFORM APERTURES AND NASAL BONES IN PATIENTS WITH NORMAL CONFIGURATION AND DIFFERENT AESTHETIC DEFORMITIES OF EXTERNAL NOSE USING MULTISLICE COMPUTED TOMOGRAPHY

2018 ◽  
Vol 99 (5) ◽  
pp. 237-243
Author(s):  
D. A. Lezhnev ◽  
D. V. Davydov ◽  
M. O. Dutova ◽  
V. V. Petrovskaya
Keyword(s):  
Computed Tomography ◽  
Anatomical Variants ◽  
Nasal Bones ◽  
External Nose ◽  
Normal Configuration ◽  
Aesthetic Results ◽  
Characteristic Features ◽  
3D Volume ◽  
3D Volume Rendering ◽  
Long Nose

Objective. To identify the anatomical variants of nasal bones and pyriform apertures in view of normal configuration of external nose and different types of aesthetic nasal deformities, to estimate its possible relations.Material and methods. We performed a retrospective analysis of multi-slice computed tomography (MSCT) data of 2737 patients with the image processing (multiplanar and 3D-volume rendering). The sample comprised 121 patients with aesthetic nasal deformities (rhinokyphosis – nasal hump, long nose, combined deformity like a hidden hump, short nose, wide nose) and 37 individuals with normal European nasal configuration.Results. The most frequent variants of pyriform apertures are drop, heart and pear types. The most common variants of nasal bones in all groups were II, V, VI types according to Lang and Baumeister. Every kind of deformities was described with their characteristic features of pyriform apertures and nasal bones.Conclusion. Statistically proved correlation between the facts of deformities and variants of pyriform apertures and nasal bones was obtained. The preoperative study of variable anatomy must be always performed for improving functional and aesthetic results of rhinoplasty.

Prevalence of coronary artery intramyocardial course in a large population of clinical patients detected by multislice computed tomography coronary angiography

2008 ◽  
Vol 49 (8) ◽  
pp. 895-901 ◽  
Author(s):  
R. De Rosa ◽  
M. Sacco ◽  
C. Tedeschi ◽  
R. Pepe ◽  
P. Capogrosso ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Heart Rate ◽  
Coronary Artery ◽  
Coronary Arteries ◽  
Imaging Method ◽  
Coronary Anomaly ◽  
Myocardial Bridging ◽  
Significant Difference ◽  
Study Population ◽  
The Mean

Background: Intramyocardial course, an inborn coronary anomaly, is defined as a segment of a major epicardial coronary artery that runs intramurally through the myocardium; in particular, we distinguish myocardial bridging, in which the vessel returns to an epicardial position after the muscle bridge, and intramyocardial course, which is described as a vessel running and ending in the myocardium. Purpose: To evaluate the prevalence of myocardial bridging and intramyocardial course of coronary arteries as defined by multidetector computed tomography (MDCT) angiography. Material and Methods: The study population consisted of 242 consecutive patients (211 men, 31 women; mean age 59±6 years) with atypical chest pain admitted to our hospital between December 2004 and September 2006. All MDCT examinations were performed using a 16-detector-row scanner (Aquilion 16 CFX; Toshiba Medical System, Tokyo, Japan). Patients with heart rate above 65 bpm received 50 mg atenolol orally for 3 days prior to the MDCT scan, or they increased their usual therapy with beta-blockers, in order to obtain a prescan heart rate <60 bpm. Curved multiplanar and 3D volume reconstructions were performed to explore coronary anatomy. Results: In 235 patients, the CT scan was successful and images were appropriate for evaluation. The prevalence of myocardial bridging and intramyocardial course of coronary arteries was 18.7% (47 cases) in our patient population. In 30 segments (63.8%), the vessels ran and ended in the myocardium. In the remaining 17 segments (36.2%), the vessels returned to an epicardial position after the muscle bridge. We found no difference in the prevalence of this inborn coronary anomaly when comparing different clinical characteristics of the study population (sex, age, body-mass index [BMI], etc.). The mean length of the subepicardial artery was 7 mm (range 5–12 mm), and the mean depth in the diastolic phase was 1.9 mm (range 1.2–2.3 mm). There was no significant difference of diameter in these segments between the different R–R phases examined. Conclusion: Our study is in agreement with major angiographic literature reporting a prevalence of myocardial bridging and intramyocardial course between 0.5% and 33%. MDCT technology represents a useful, noninvasive imaging method to assess and evaluate the location, depth, and length of this anatomical variation.

scholarly journals Diagnostic Phase of Calcium Scoring Scan Applied as the Center of Acquisition Window of Coronary Computed Tomography Angiography Improves Image Quality in Minimal Acquisition Window Scan (Target CTA Mode) Using the Second Generation 320-Row CT

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Eriko Maeda ◽  
Kodai Yamamoto ◽  
Shigeaki Kanno ◽  
Kenji Ino ◽  
Nobuo Tomizawa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Computed Tomography Angiography ◽  
Cardiac Ct ◽  
Coronary Computed Tomography Angiography ◽  
Calcium Scoring ◽  
Acquisition Window ◽  
Coronary Computed Tomography ◽  
The Mean

Objective.To compare the image quality of coronary computed tomography angiography (CCTA) acquired under two conditions: 75% fixed as the acquisition window center (Group 75%) and the diagnostic phase for calcium scoring scan as the center (CS; Group CS).Methods.320-row cardiac CT with a minimal acquisition window (scanned using “Target CTA” mode) was performed on 81 patients. In Group 75% (n= 40), CS was obtained and reconstructed at 75% and the center of the CCTA acquisition window was set at 75%. In Group CS (n= 41), CS was obtained at 75% and the diagnostic phase showing minimal artifacts was applied as the center of the CCTA acquisition window. Image quality was evaluated using a four-point scale (4-excellent) and the mean scores were compared between groups.Results.The CCTA scan diagnostic phase occurred significantly earlier in CS (75.7 ± 3.2% vs. 73.6 ± 4.5% for Groups 75% and CS, resp.,p= 0.013). The mean Group CS image quality score (3.58 ± 0.63) was also higher than that for Group 75% (3.19 ± 0.66,p< 0.0001).Conclusions.The image quality of CCTA in Target CTA mode was significantly better when the center of acquisition window is adjusted using CS.

Proper Shoulder Position for Subclavian Venipuncture

2004 ◽  
Vol 101 (6) ◽  
pp. 1306-1312 ◽  
Author(s):  
Norihito Kitagawa ◽  
Mayuko Oda ◽  
Tadahide Totoki ◽  
Noriaki Miyazaki ◽  
Ichiroh Nagasawa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Success Rate ◽  
Subclavian Vein ◽  
Multislice Computed Tomography ◽  
Spatial Relations ◽  
Safety And Reliability ◽  
Vein Diameter ◽  
The Mean ◽  
Shoulder Position ◽  
Adult Volunteers

Background Although the Trendelenburg position and shoulder bracing are recommended for safe subclavian venipuncture, the optimal shoulder position remains unclear. The current study observed spatial relations between the subclavian vein and surrounding structures using multislice computed tomography to determine optimal shoulder position for safe subclavian venipuncture and then conducted a small follow-up clinical trial to confirm these findings. Methods Thoracic multislice computed tomography was performed for seven adult volunteers at three shoulder positions: elevated (up); neutral; and lowered caudally (down). Overlap and distance between the clavicle and the subclavian vein and the diameter of the subclavian vein were measured. Anatomical relations between the subclavian artery and vein were also observed. The success rate for subclavian venipuncture was then compared between the up and down shoulder positions in 30 patients. Results In the multislice computed tomography study, the mean overlap ratios between clavicle and subclavian vein in the up, neutral, and down positions were 33.5, 36.9, and 40.0%, respectively. Overlap increased with lower shoulder position (up &lt; neutral &lt; down; P &lt; 0.05). The mean distances between the clavicle and the subclavian vein in the up, neutral, and down positions were 6.8, 5.0, and 3.6 mm, respectively. Again, distance decreased with lower shoulder position (up &lt; neutral &lt; down; P &lt; 0.05). The diameter of the subclavian vein did not differ among the three shoulder positions. The success rate for subclavian venipuncture was significantly higher in the down position compared with the up position (P = 0.003). Conclusions Lowered shoulder position increases both overlap and proximity between the clavicle and the subclavian vein, producing a more constant relation between the clavicle and the subclavian vein, without affecting vein diameter. Proper use of a lowered shoulder position should thus increase the safety and reliability of subclavian venipuncture compared with other shoulder positions.

scholarly journals Efficacy of a four-tier infection response system in the emergency department during the coronavirus disease-2019 outbreak

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256116
Author(s):  
Arom Choi ◽  
Ha Yan Kim ◽  
Ara Cho ◽  
Jiyoung Noh ◽  
Incheol Park ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Mean Difference ◽  
Brain Computed Tomography ◽  
St Segment Elevation ◽  
St Segment ◽  
Quality Of Medical Care ◽  
The Mean ◽  
Suspected Stroke ◽  
Door To Balloon

Introduction The coronavirus disease (COVID-19) pandemic has delayed the management of other serious medical conditions. This study presents an efficient method to prevent the degradation of the quality of diagnosis and treatment of other critical diseases during the pandemic. Methods We performed a retrospective observational study. The primary outcome was ED length of stay (ED LOS). The secondary outcomes were the door-to-balloon time in patients with suspected ST-segment elevation myocardial infarction and door-to-brain computed tomography time for patients with suspected stroke. The outcome measures were compared between patients who were treated in the red and orange zones designated as the changeable isolation unit and those who were treated in the non-isolation care unit. To control confounding factors, we performed propensity score matching, following which, outcomes were analyzed for non-inferiority. Results The mean ED LOS for hospitalized patients in the isolation and non-isolation care units were 406.5 min (standard deviation [SD], 237.9) and 360.2 min (SD, 226.4), respectively. The mean difference between the groups indicated non-inferiority of the isolation care unit (p = 0.037) but not in the patients discharged from the ED (p>0.999). The mean difference in the ED LOS for patients admitted to the ICU between the isolation and non-isolation care units was -22.0 min (p = 0.009). The mean difference in the door-to-brain computed tomography time between patients with suspected stroke in the isolation and non-isolation care units was 7.4 min for those with confirmed stroke (p = 0.013), and -20.1 min for those who were discharged (p = 0.012). The mean difference in the door-to-balloon time between patients who underwent coronary angiography in the isolation and non-isolation care units was -2.1 min (p<0.001). Conclusions Appropriate and efficient handling of a properly planned ED plays a key role in improving the quality of medical care for other critical diseases during the COVID-19 outbreak.

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