Local recurrence of rectal cancer: MR imaging before and after oral superparamagnetic particles vs contrast-enhanced computed tomography

2000 ◽  
Vol 10 (9) ◽  
pp. 1383-1389 ◽  
Author(s):  
L. Blomqvist ◽  
H. Ohlsén ◽  
T. Hindmarsh ◽  
E. Jonsson ◽  
T. Holm
Keyword(s):  
Computed Tomography ◽  
Rectal Cancer ◽  
Local Recurrence ◽  
Mr Imaging ◽  
Superparamagnetic Particles ◽  
Contrast Enhanced ◽  
Before And After ◽  
Enhanced Computed Tomography ◽  
Contrast Enhanced Computed Tomography ◽  
Recurrence Of Rectal Cancer

scholarly journals The ‘step-clipping’ method: a guide for identifying a previously bleeding colonic diverticulum

2020 ◽  
Vol 08 (01) ◽  
pp. E64-E69
Author(s):  
Hirosato Tamari ◽  
Taiki Aoyama ◽  
Kenjiro Shigita ◽  
Naoki Asayama ◽  
Akira Fukumoto ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Target Lesion ◽  
Diverticular Bleeding ◽  
Computed Tomography Images ◽  
Contrast Enhanced ◽  
Before And After ◽  
Colonic Diverticular Bleeding ◽  
Enhanced Computed Tomography ◽  
Short Time ◽  
Contrast Enhanced Computed Tomography

Abstract Background and study aims Unsatisfactory detectability of a previously bleeding diverticulum by colonoscopy results from difficulty in precisely locating the target lesion, even with presence of an extravasation on contrast-enhanced computed tomography (CECT). This study aimed to evaluate the usefulness of the step-clipping method to overcome this limitation. Patients and methods Step-clipping was indicated for patients with colonic diverticular bleeding and presence of extravasation on CECT, but with absence of active bleeding on subsequent colonoscopy. The target diverticulum was identified by comparing computed tomography images before and after step clipping, which provided a positional relationship between each clip and the target lesion. Results Based on data from 21 consecutive cases meeting our inclusion criteria (14 men and 7 women; mean age, 73.2 years), the target diverticulum was endoscopically identified in 20 cases (95 %), in a median time of 5 minutes, and successfully treated. No adverse events were observed with the step-clipping method. Conclusion Step-clipping provided easy guidance to the target site for treatment in a short time, despite spontaneous cessation of bleeding at the diverticulum.

Contrast-Enhanced Computed Tomography to Show Perivesical Extension in Bladder Carcinoma

1987 ◽  
Vol 28 (3) ◽  
pp. 307-311 ◽  
Author(s):  
E. M. Sager ◽  
K. Talle ◽  
S. D. Fosså ◽  
S. Ous ◽  
A. E. Stenwig
Keyword(s):  
Computed Tomography ◽  
Contrast Medium ◽  
Intravenous Contrast ◽  
Intravenous Contrast Medium ◽  
Contrast Enhanced ◽  
Before And After ◽  
Muscle Invasive ◽  
Enhanced Computed Tomography ◽  
Improved Accuracy ◽  
Contrast Enhanced Computed Tomography

Fifty-two patients (53 lesions) with muscle invasive carcinoma (T2/T3) of the urinary bladder were examined with computed tomography (CT) before planned total cystectomy. The object of CT was to demonstrate perivesical growth. All patients were examined before and after intravenous injection of contrast medium. The stages obtained from the precontrast and postcontrast scans were compared with the histopathologic stage from the cystectomy specimen. CT staged correctly 35 of the 53 lesions in the precontrast series and 46 of the 53 lesions in the postcontrast series. The improved accuracy from contrast enhancement resulted primarily from fewer cases being overstaged. The use of intravenous contrast medium improved accuracy of CT in evaluation of perivescial tumor growth.

scholarly journals Porcine Ex Vivo Liver Phantom for Dynamic Contrast-Enhanced Computed Tomography

2011 ◽  
Vol 46 (9) ◽  
pp. 586-593 ◽  
Author(s):  
Scott M. Thompson ◽  
Juan C. Ramirez-Giraldo ◽  
Bruce Knudsen ◽  
Joseph P. Grande ◽  
Jodie A. Christner ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Ex Vivo ◽  
Dynamic Contrast Enhanced ◽  
Contrast Enhanced ◽  
Enhanced Computed Tomography ◽  
Liver Phantom ◽  
Contrast Enhanced Computed Tomography

scholarly journals Contrast enhanced computed tomography findings in 105 horse distal extremities.

2021 ◽  
pp. 103704
Author(s):  
Frederik Pauwels ◽  
Angela Hartmann ◽  
John Al-Alawneh ◽  
Paul Wightman ◽  
Jimmy Saunders
Keyword(s):  
Computed Tomography ◽  
Contrast Enhanced ◽  
Enhanced Computed Tomography ◽  
Contrast Enhanced Computed Tomography

scholarly journals Self-navigated 3D whole-heart MRA for non-enhanced surveillance of thoracic aortic dilation: a comparison to CTA

2021 ◽  
Vol 22 (Supplement_1) ◽  
Author(s):  
P Poskaite ◽  
M Pamminger ◽  
C Kranewitter ◽  
C Kremser ◽  
M Reindl ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Aortic Aneurysm ◽  
Thoracic Aortic Aneurysm ◽  
Aortic Dilation ◽  
Subjective Image Quality ◽  
Contrast Enhanced ◽  
Whole Heart ◽  
Enhanced Computed Tomography ◽  
Contrast Enhanced Computed Tomography

Abstract Funding Acknowledgements Type of funding sources: None. Background The natural history of thoracic aortic aneurysm (TAA) is one of progressive expansion. Asymptomatic patients who do not meet criteria for repair require conservative management including ongoing aneurysm surveillance, mostly carried out by contrast-enhanced computed tomography angiography (CTA). Purpose To prospectively compare image quality and reliability of a prototype non-contrast, self-navigated 3D whole-heart magnetic resonance angiography (MRA) with contrast-enhanced computed tomography angiography (CTA) for sizing of thoracic aortic aneurysm (TAA). Methods Self-navigated 3D whole-heart 1.5 T MRA was performed in 20 patients (aged 67 ± 8.6 years, 75% male) for sizing of TAA; a subgroup of 18 (90%) patients underwent additional contrast-enhanced CTA on the same day. Subjective image quality was scored according to a 4-point Likert scale and ratings between observers were compared by Cohen’s Kappa statistics. Continuous MRA and CTA measurements were analyzed with regression and Bland-Altman analysis. Results Overall subjective image quality as rated by two observers was 1 [interquartile range (IQR) 1-2] for self-navigated MRA and 1.5 [IQR 1-2] for CTA (p = 0.717). For MRA a perfect inter-observer agreement was found for presence of artefacts and subjective image sharpness (κ=1). Subjective signal inhomogeneity correlated highly with objectively quantified inhomogeneity of the blood pool signal (r = 0.78-0.824, all p <0.0001). Maximum diameters of TAA as measured by self-navigated MRA and CTA showed excellent correlation (r = 0.997, p < 0.0001) without significant inter-method bias (bias -0.0278, lower and upper limit of agreement -0.74 and 0.68, p = 0.749). Inter- and intraobserver correlation of aortic aneurysm as measured by MRA was excellent (r = 0.963 and 0.967, respectively) without significant bias (all p ≤ 0.05). Conclusion Self-navigated 3D whole-heart MRA enables reliable contrast- and radiation free aortic dilation surveillance without significant difference to standardized CTA while providing predictable acquisition time and by offering excellent image quality. Abstract Figure.

Sign in / Sign up

Export Citation Format

Share Document