Power contrast injections through a totally implantable venous power port: A retrospective multicenter study

2019 ◽  
Vol 35 (4) ◽  
pp. 268-272 ◽  
Author(s):  
Ryong seong Son ◽  
Yun Gyu Song ◽  
Jeonghyun Jo ◽  
Byeong-Ho Park ◽  
Gyoo-sik Jung ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Logistic Regression ◽  
Regression Analysis ◽  
Contrast Media ◽  
Logistic Regression Analysis ◽  
Computed Tomography Scan ◽  
Power Injection ◽  
Oncologic Patients ◽  
Computed Tomography Scans ◽  
Tomography Scan

Objectives To evaluate the feasibility and safety of power injection of contrast media through totally implantable venous power ports during computed tomography scans in oncologic patients. Methods The study population consisted of 417 patients who underwent computed tomography scan through a totally implantable venous power port. Clinical data were examined. Logistic regression analysis was used to assess the associations between clinical covariables and computed tomography scan failure. Results Successful computed tomography scans were achieved in 534 of 540 examinations (98.9%). Logistic regression analysis showed that contrast media above a 350 concentration was significantly associated with computed tomography scan failure (95% confidence interval: 1.01–1.13, p = 0.012). No major complications were noted. Conclusions Power injection of contrast media through a totally implantable venous power port for computed tomography examination is feasible and safe. This procedure provides an acceptable alternative in oncologic patients with inadequate peripheral intravenous access when computed tomography examination with contrast enhancement is needed.

scholarly journals Biomechanics and Clinical Application of Translaminar Screws Fixation in Spine: A Review of the Literature

2018 ◽  
Vol 9 (2) ◽  
pp. 210-218
Author(s):  
Jimmy J. Chan ◽  
Nicholas Shepard ◽  
Woojin Cho
Keyword(s):  
Computed Tomography ◽  
Clinical Application ◽  
Pediatric Population ◽  
Thoracolumbar Spine ◽  
Surgical Techniques ◽  
Computed Tomography Scan ◽  
Translaminar Screw ◽  
Computed Tomography Scans ◽  
Translaminar Screws ◽  
Tomography Scan

Study Design: Broad narrative review. Objectives: Translaminar screw (TLS) fixation was first described as a salvage technique for fixation of the axial spine. Better understanding of the spine anatomy allows for advancement in surgical techniques and expansion of TLS indications. The goal of this review is to discuss the anatomic feasibility of the TLS fixation in different region of the spine. Methods: A review of the current literatures on the principles, biomechanics, and clinical application of the translaminar screw technique in the axial, subaxial, and thoracolumbar spine. Results: Anatomic feasibility and biomechanical studies have demonstrated that TLS is a safe and strong fixation methods for fusion beyond just the axial spine. However, not all spine segments have wide enough lamina to accept TLS. Preoperative computed tomography scan can help ensure the feasibility and safety of TLS insertion. Recent clinical reports have validated the application of TLS in subaxial spine, thoracic spine, hangman’s fracture, and pediatric population. Conclusions: TLS can be used beyond axial spine; however, TLS insertion is only warranted when the lamina is thick enough to avoid further complications such as breakage. Preoperative computed tomography scans can be used to determine feasibility of such fixation construct.

Cuboid stress fracture. A case report

1993 ◽  
Vol 83 (3) ◽  
pp. 153-155 ◽  
Author(s):  
JB Chen
Keyword(s):  
Computed Tomography ◽  
Case Report ◽  
Stress Fracture ◽  
Healing Process ◽  
X Rays ◽  
Computed Tomography Scan ◽  
X Ray ◽  
Computed Tomography Scans ◽  
Bone Changes ◽  
Tomography Scan

Because a stress fracture is rare and easily missed on an x-ray, it might go undetected. If a patient presents with an activity related injury to the midfoot and x-rays are negative, a computed tomography scan can be helpful in diagnosing a cuboid stress fracture. Also, computed tomography scans graphically show the fracture location and size, in addition to tracking progressive bone changes during the healing process.

Lung Inhomogeneities and Time Course of Ventilator-induced Mechanical Injuries

2015 ◽  
Vol 123 (3) ◽  
pp. 618-627 ◽  
Author(s):  
Massimo Cressoni ◽  
Chiara Chiurazzi ◽  
Miriam Gotti ◽  
Martina Amini ◽  
Matteo Brioni ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Time Course ◽  
Interquartile Range ◽  
Lung Edema ◽  
Stress And Strain ◽  
Computed Tomography Scan ◽  
Alveolar Collapse ◽  
Volume Ventilation ◽  
Computed Tomography Scans ◽  
Tomography Scan

Abstract Background: During mechanical ventilation, stress and strain may be locally multiplied in an inhomogeneous lung. The authors investigated whether, in healthy lungs, during high pressure/volume ventilation, injury begins at the interface of naturally inhomogeneous structures as visceral pleura, bronchi, vessels, and alveoli. The authors wished also to characterize the nature of the lesions (collapse vs. consolidation). Methods: Twelve piglets were ventilated with strain greater than 2.5 (tidal volume/end-expiratory lung volume) until whole lung edema developed. At least every 3 h, the authors acquired end-expiratory/end-inspiratory computed tomography scans to identify the site and the number of new lesions. Lung inhomogeneities and recruitability were quantified. Results: The first new densities developed after 8.4 ± 6.3 h (mean ± SD), and their number increased exponentially up to 15 ± 12 h. Afterward, they merged into full lung edema. A median of 61% (interquartile range, 57 to 76) of the lesions appeared in subpleural regions, 19% (interquartile range, 11 to 23) were peribronchial, and 19% (interquartile range, 6 to 25) were parenchymal (P < 0.0001). All the new densities were fully recruitable. Lung elastance and gas exchange deteriorated significantly after 18 ± 11 h, whereas lung edema developed after 20 ± 11 h. Conclusions: Most of the computed tomography scan new densities developed in nonhomogeneous lung regions. The damage in this model was primarily located in the interstitial space, causing alveolar collapse and consequent high recruitability.

Differential Diagnosis of Malignant Thyroid Calcification Nodule Based on Computed Tomography Image Texture

2021 ◽  
Vol 11 (3) ◽  
pp. 767-772
Author(s):  
Wenxian Peng ◽  
Yijia Qian ◽  
Yingying Shi ◽  
Shuyun Chen ◽  
Kexin Chen ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Support Vector Machine ◽  
Logistic Regression ◽  
Regression Analysis ◽  
Ensemble Learning ◽  
Logistic Regression Analysis ◽  
Texture Features ◽  
Support Vector ◽  
Classification Algorithms ◽  
Feature Optimization

Purpose: Calcification nodules in thyroid can be found in thyroid disease. Current clinical computed tomography systems can be used to detect calcification nodules. Our aim is to identify the nature of thyroid calcification nodule based on plain CT images. Method: Sixty-three patients (36 benign and 27 malignant nodules) found thyroid calcification nodules were retrospectively analyzed, together with computed tomography images and pathology finding. The regions of interest (ROI) of 6464 pixels containing calcification nodules were manually delineated by radiologists in CT plain images. We extracted thirty-one texture features from each ROI. And nineteen texture features were picked up after feature optimization by logistic regression analysis. All the texture features were normalized to [0, 1]. Four classification algorithms, including ensemble learning, support vector machine, K-nearest neighbor, decision tree, were used as classification algorithms to identity the benign and malignant nodule. Accuracy, PPV, NPV, SEN, and AUC were calculated to evaluate the performance of different classifiers. Results: Nineteen texture features were selected after feature optimization by logistic regression analysis (P <0.05). Both Ensemble Learning and Support Vector Machine achieved the highest accuracy of 97.1%. The PPV, NPV, SEN, and SPC are 96.9%, 97.4%, 98.4%, and 95.0%, respectively. The AUC was 1. Conclusion: Texture features extracted from calcification nodules could be used as biomarkers to identify benign or malignant thyroid calcification.

scholarly journals Sella turcica bridging and ossified carotico-clinoid ligament: Correlation with sex and age

2018 ◽  
Vol 31 (3) ◽  
pp. 299-304 ◽  
Author(s):  
Daniele Gibelli ◽  
Michaela Cellina ◽  
Stefano Gibelli ◽  
Marta Panzeri ◽  
Antonio Giancarlo Oliva ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Logistic Regression ◽  
Regression Analysis ◽  
Surgical Procedures ◽  
Age Groups ◽  
Sella Turcica ◽  
Anterior Clinoid Process ◽  
Computed Tomography Scans ◽  
The Mean ◽  
Age And Sex

Aim Sella turcica bridging and ossified carotico-clinoid ligament are two variants of the sella turcica, the origin of which is partially unknown. These variations should be properly recognised, as they may hamper the removal of the anterior clinoid process in surgical procedures. Therefore, our aim was to determine the prevalence of these two anatomical variants and to investigate their prevalence according to patient sex and age in a series of maxilla computed tomography scans. Materials and methods We revised 300 computed tomography scans of the head from northern Italian patients, stratified into three age groups (18–40 years, 41–60 years, >60 years): a logistic regression analysis was used to explore an association of sella turcica bridging with age and sex through Matlab software, also including a test for the extracted model ( P < 0.05). Results The mean prevalence of sella turcica bridging and ossified carotico-clinoid ligament were 0.16 ± 0.06 (48/300, 16.0%) and 0.09 ± 0.03 (26/300, 8.7%), respectively. Statistically significant differences according to sex were found neither for sella turcica bridging ( P = 0.345) nor for ossified carotico-clinoid ligament ( P = 0.412). Only sella turcica bridging showed a correlation with age ( P = 0.007). In addition, the two variants were often associated, as patients without sella turcica bridging usually did not show ossified carotico-clinoid ligament ( P < 0.001). Discussion Our results suggest an association between the two variants, and provide a novel contribution to the debate around their origin.

Safety Zone for Splenic Hilar Control during Splenectomy: A Computed Tomography Scan Mapping of the Tail of the Pancreas in Relation to the Splenic Hilum

2007 ◽  
Vol 73 (9) ◽  
pp. 890-894 ◽  
Author(s):  
Alan A. Saber ◽  
Brandon Helbling ◽  
Kamran Khaghany ◽  
Goel Nirmit ◽  
Ronald Pimental ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Average Distance ◽  
Computed Tomography Scan ◽  
Vascular Control ◽  
Splenic Hilum ◽  
Risk Of Injury ◽  
Computed Tomography Scans ◽  
Hilar Dissection ◽  
Tomography Scan ◽  
Preventable Complication

Inadvertent injury to the tail of the pancreas is a potentially serious but preventable complication that can occur during laparoscopic splenectomy. The aim of this study was to determine the feasibility of using computed tomography to map the location of the tail of the pancreas relative to the spleen to locate a possible safe zone for splenic hilar dissection and/or hemostasis. Abdominal computed tomography scans of 150 patients were studied. The distance from the tail of the pancreas to the hilum of the spleen was determined for each patient. Resultant descriptive statistics were correlated with patient's age, gender, body mass index, and spleen size using the independent t test, Pearson's correlation coefficient, and multivariate analysis. Computed tomography was successful in mapping the distance from the tail of the pancreas to the splenic hilum in 148 patients. The average distance from the tail of the pancreas to the splenic hilum was 3.42 cm ± 1.54 cm (95% confidence interval, 3.17–3.67). During splenic vascular control, it is important to stay within 1 cm from the splenic hilum to minimize the risk of injury to the tail of the pancreas during splenectomy.

The value of computed tomography scans in the diagnosis and management following invasive arterial investigation

Vascular ◽  
2011 ◽  
Vol 20 (1) ◽  
pp. 57-59
Author(s):  
Stuart Walker ◽  
Anthony Beasley
Keyword(s):  
Computed Tomography ◽  
Abdominal Aortic Aneurysm ◽  
Correct Diagnosis ◽  
Cardiovascular Collapse ◽  
Computed Tomography Scan ◽  
Accessory Renal Artery ◽  
Abdominal Aortic ◽  
Computed Tomography Scans ◽  
Tomography Scan ◽  
Artery Branch

We report a patient who was known to have an abdominal aortic aneurysm and was being assessed for endovascular repair by calibrated angiogram, who developed back pain and cardiovascular collapse, where a computed tomography scan proved essential in establishing the correct diagnosis – bleed from an accessory renal artery branch.

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