In ovo imaging using ostrich eggs – physiological embryonal development on serial CT scans

2021 ◽  
Author(s):  
T Winkens ◽  
A Christl ◽  
C Kühnel ◽  
F Ndum ◽  
M Freesmeyer
Keyword(s):  
Ct Scans ◽  
In Ovo ◽  
Embryonal Development ◽  
Serial Ct

Short Observation Period and Aggressive Discharge of Patients With Head Injury and Serial CT Scans

2021 ◽  
pp. 000313482110635
Author(s):  
Jordan Perkins ◽  
Jacob Shreffler ◽  
Danielle Kamenec ◽  
Alexandra Bequer ◽  
Corey Ziemba ◽  
...  
Keyword(s):  
Ct Scanning ◽  
Ct Scans ◽  
New Findings ◽  
Serial Ct ◽  
Radiographic Interpretation ◽  
Evidence Based Guidelines ◽  
Head Computed Tomography ◽  
Repeat Imaging ◽  
Observation Period ◽  
Negative Conversion

Background: Many patients undergo two head computed tomography (CT) scans after mild traumatic brain injury (TBI). Radiographic progression without clinical deterioration does not usually alter management. Evidence-based guidelines offer potential for limited repeat imaging and safe discharge. This study characterizes patients who had two head CTs in the Emergency Department (ED), determines the change between initial and repeat CTs, and describes timing of repeat scans. Methods: This retrospective series includes all patients with head CTs during the same ED visit at an urban trauma center between May 1st, 2016 and April 30th, 2018. Radiographic interpretation was coded as positive, negative, or equivocal. Results: Of 241 subjects, the number of positive, negative, and equivocal initial CT results were 154, 50, and 37, respectively. On repeat CT, 190 (78.8%) interpretations were congruent with the original scan. Out of the 21.2% of repeat scans that diverged from the original read, 14 (5.8%) showed positive to negative conversion, 1 (.4%) showed positive to equivocal conversion, 2 (.88%) showed negative to positive conversion, 20 (8.3%) showed equivocal to negative conversion, and 14 (5.8%) showed equivocal to positive conversion. Average time between scans was 4.4 hours, and median length of stay was 10.2 hours. Conclusions: In this retrospective review, most repeat CT scans had no new findings. A small percentage converted to positive, rarely altering clinical management. This study demonstrates the need for continued prospective research to update clinical guidelines that could reduce admission and serial CT scanning for mild TBI.

Machine learning for lung texture analysis on thin-section CT: Capability for assessments of disease severity and therapeutic effect for connective tissue disease patients in comparison with expert panel evaluations

2021 ◽  
pp. 028418512110449
Author(s):  
Yoshiharu Ohno ◽  
Kota Aoyagi ◽  
Daisuke Takenaka ◽  
Takeshi Yoshikawa ◽  
Yasuko Fujisawa ◽  
...  
Keyword(s):  
Machine Learning ◽  
Texture Analysis ◽  
Disease Severity ◽  
Thin Section ◽  
Ct Scans ◽  
Normal Lung ◽  
Quantitative Index ◽  
Serial Ct ◽  
Ct Texture Analysis

Background The need for quantitative assessment of interstitial lung involvement on thin-section computed tomography (CT) has arisen in interstitial lung diseases including connective tissue disease (CTD). Purpose To evaluate the capability of machine learning (ML)-based CT texture analysis for disease severity and treatment response assessments in comparison with qualitatively assessed thin-section CT for patients with CTD. Material and Methods A total of 149 patients with CTD-related ILD (CTD-ILD) underwent initial and follow-up CT scans (total 364 paired serial CT examinations), pulmonary function tests, and serum KL-6 level tests. Based on all follow-up examination results, all paired serial CT examinations were assessed as “Stable” (n = 188), “Worse” (n = 98) and “Improved” (n = 78). Next, quantitative index changes were determined by software, and qualitative disease severity scores were assessed by consensus of two radiologists. To evaluate differences in each quantitative index as well as in disease severity score between paired serial CT examinations, Tukey's honestly significant difference (HSD) test was performed among the three statuses. Stepwise regression analyses were performed to determine changes in each pulmonary functional parameter and all quantitative indexes between paired serial CT scans. Results Δ% normal lung, Δ% consolidation, Δ% ground glass opacity, Δ% reticulation, and Δdisease severity score showed significant differences among the three statuses ( P < 0.05). All differences in pulmonary functional parameters were significantly affected by Δ% normal lung, Δ% reticulation, and Δ% honeycomb (0.16 ≤r2 ≤0.42; P < 0.05). Conclusion ML-based CT texture analysis has better potential than qualitatively assessed thin-section CT for disease severity assessment and treatment response evaluation for CTD-ILD.

Early ischemic lesion on computed tomography: predictor of poor outcome among survivors of aneurysmal subarachnoid hemorrhage

2007 ◽  
Vol 107 (6) ◽  
pp. 1074-1079 ◽  
Author(s):  
Jari Siironen ◽  
Matti Porras ◽  
Joona Varis ◽  
Kristiina Poussa ◽  
Juha Hernesniemi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Subarachnoid Hemorrhage ◽  
Independent Predictor ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Ct Scans ◽  
Ischemic Lesion ◽  
Poor Outcome ◽  
Serial Ct ◽  
Early Lesion

Object Identifying ischemic lesions after subarachnoid hemorrhage (SAH) is important because the appearance of these lesions on follow-up imaging correlates with a poor outcome. The effect of ischemic lesions seen on computed tomography (CT) scans during the first days of treatment remains unknown, however. Methods In 156 patients with SAH, clinical course and outcome, as well as the appearance of ischemic lesions on serial CT scans, were prospectively monitored for 3 months. At 3 months after SAH, magnetic resonance imaging was performed to detect permanent lesions that had not been visible on CT. Results Of the 53 patients with no lesions on any of the follow-up CT scans, four (8%) had a poor outcome. Of the 52 patients with a new hypodense lesion on the first postoperative day CT, 23 (44%) had a poor outcome. Among the remaining 51 patients with a lesion appearing later than the first postoperative morning, 10 (20%) had a poor outcome (p < 0.001). After adjusting for patient age; clinical condition on admission; amounts of subarachnoid, intracerebral, and intraventricular blood; and plasma glucose and D-dimer levels, a hypodense lesion on CT on the first postoperative morning was an independent predictor of poor outcome after SAH (odds ratio 7.27, 95% confidence interval 1.54–34.37, p < 0.05). Conclusions A new hypodense lesion on early postoperative CT seems to be an independent risk factor for poor outcome after SAH, and this early lesion development may be more detrimental to clinical outcome than a later lesion occurrence.

Postoperative Computed Tomographic Evaluation of Patients with Large Pituitary Tumors Treated with Operative Decompression and Radiation Therapy

Neurosurgery ◽  
1991 ◽  
Vol 28 (2) ◽  
pp. 238-241 ◽  
Author(s):  
Paul B. Nelson ◽  
Alan G. Robinson ◽  
William Hirsch
Keyword(s):  
Radiation Therapy ◽  
Pituitary Tumors ◽  
Residual Tumor ◽  
Early Postoperative Period ◽  
Ct Scans ◽  
Computed Tomographic ◽  
Ct Evaluation ◽  
Serial Ct ◽  
The Mean ◽  
Operative Decompression

Abstract Thirty consecutive patients who underwent operative decompression and radiation therapy for large sellar and suprasellar pituitary tumors (⩾2 cm) were studied in terms of the serial computed tomographic (CT) changes. There were 23 men and 7 women. The mean age was 49.6 ± 2.5 years, and the mean follow-up was 45.3 ± 3.9 months. Twenty-eight of the 30 patients had transsphenoidal surgery, and 27 had hormonally inactive tumors. Radiation therapy was begun within 1 month of surgery with a mean dose of 4855 ± 70 cGy. Postoperative CT scans were obtained within 1 month of surgery and at 6- to 12-month intervals thereafter. Fourteen patients (45%) had no suprasellar tumor visualized in either the early postoperative CT scans or on subsequent scans. Eleven patients (35%) had a persistent suprasellar mass during the early postoperative period that resolved on serial CT evaluation. The mean time for resolution was 10.4 ± 1.2 months. Six patients (20%) had a persistent suprasellar mass on serial CT evaluation. A persistent postoperative mass that subsequently resolved in many of the patients was thought to be caused by the gradual retraction of the postoperative packing and hematoma, as well as the effect of radiation on any residual tumor.

Clinical stages of human brain abscesses on serial CT scans after contrast infusion

1983 ◽  
Vol 59 (6) ◽  
pp. 972-989 ◽  
Author(s):  
Richard H. Britt ◽  
Dieter R. Enzmann
Keyword(s):  
Human Brain ◽  
Contrast Enhancement ◽  
Brain Abscess ◽  
Ct Scans ◽  
Corticosteroid Administration ◽  
Content Type ◽  
Brain Abscesses ◽  
Serial Ct ◽  
Autopsy Specimens

✓ The authors describe a classification of human brain abscesses into stages of development as demonstrated on computerized tomography (CT) scans. The results of CT staging of 14 human brain abscesses are compared with the previously published findings in an experimental brain abscess model developed by the same authors. The CT criteria for categorizing brain abscesses into cerebritis and capsule stages were based on the pattern of contrast enhancement and the time-density curve of enhancement obtained from sequential CT scans after contrast infusion. Using these CT criteria, it was possible to accurately categorize all 14 brain abscesses into cerebritis and capsule stages. Histological examination of surgical and autopsy specimens provided immediate confirmation of the abscess stage in six patients. Indirect staging, based on surgical findings and/or subsequent autopsy findings, was possible in eight patients. Corticosteroid administration greatly reduced contrast enhancement in the cerebritis stage, but had little effect in the capsule stage. A systematic approach utilizing CT for establishing the diagnosis, staging, and treatment planning of brain abscess is proposed.

scholarly journals Pulmonary nodule registration in serial CT scans based on rib anatomy and nodule template matching

2007 ◽  
Vol 34 (4) ◽  
pp. 1336-1347 ◽  
Author(s):  
Jiazheng Shi ◽  
Berkman Sahiner ◽  
Heang-Ping Chan ◽  
Lubomir Hadjiiski ◽  
Chuan Zhou ◽  
...  
Keyword(s):  
Pulmonary Nodule ◽  
Template Matching ◽  
Ct Scans ◽  
Serial Ct

Automated detection of bone metastatic changes using serial CT scans

2017 ◽  
Vol 58 ◽  
pp. 62-74
Author(s):  
Jihun Oh ◽  
Gyehyun Kim ◽  
Jaesung Lee ◽  
Minsu Cheon ◽  
Yongsup Park ◽  
...  
Keyword(s):  
Automated Detection ◽  
Ct Scans ◽  
Serial Ct

Intracranial tuberculoma and the CT scan

1986 ◽  
Vol 64 (4) ◽  
pp. 568-574 ◽  
Author(s):  
Umesh S. Vengsarkar ◽  
Ramkrishna Prasad Pisipaty ◽  
Bharat Parekh ◽  
Venilal G. Panchal ◽  
Manohar N. Shetty
Keyword(s):  
Ct Scanning ◽  
Mass Effect ◽  
Ct Scans ◽  
Complete Disappearance ◽  
Antituberculous Therapy ◽  
Content Type ◽  
Diagnosis And Management ◽  
Intracranial Tuberculoma ◽  
Serial Ct ◽  
Fine Print

✓ Computerized tomography (CT) has greatly influenced the diagnosis and management of intracranial tuberculomas and has helped us to formulate guidelines for the management of these lesions. Solid and ringenhancing lesions seen on CT scans are diagnostic of tuberculoma if supported by other clinical and ancillary criteria. Conservative management of intracranial tuberculoma is usually indicated because serial CT scans have shown complete disappearance of these lesions with antituberculous therapy. Only lesions associated with raised intracranial pressure and CT evidence of a mass effect should be considered for surgery. Nonresponse to antituberculous therapy, as judged by serial CT scanning, should raise doubts regarding the diagnosis of a tuberculomatous lesion, and therefore such lesions should be subjected to surgery and histopathological confirmation. Representative clinical cases illustrating the principles of diagnosis and management of intracranial tuberculoma with the help of CT scanning are briefly described and discussed.

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