Potential for computer-aided diagnosis using a convolutional neural network algorithm to diagnose fat-poor angiomyolipoma in enhanced computed tomography and T2-weighted magnetic resonance imaging

2018 ◽  
Vol 25 (11) ◽  
pp. 978-979 ◽  
Author(s):  
Takahiko Soma ◽  
Junichiro Ishioka ◽  
Hajime Tanaka ◽  
Yoh Matsuoka ◽  
Kazutaka Saito ◽  
...  
Keyword(s):  
Neural Network ◽  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Computer Aided ◽  
Weighted Magnetic Resonance Imaging ◽  
Neural Network Algorithm ◽  
Enhanced Computed Tomography ◽  
Aided Diagnosis

Evaluation of Extramural Venous Invasion by Diffusion-Weighted Magnetic Resonance Imaging and Computed Tomography in Rectal Adenocarcinoma

2019 ◽  
Vol 70 (4) ◽  
pp. 457-465 ◽  
Author(s):  
Aysegul Gursoy Coruh ◽  
Elif Peker ◽  
Atilla Elhan ◽  
Ilhan Erden ◽  
Ayse Erden
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Roc Analysis ◽  
Rectal Adenocarcinoma ◽  
Venous Invasion ◽  
Distant Metastases ◽  
Resonance Imaging ◽  
Adc Values ◽  
Weighted Magnetic Resonance Imaging

Purpose The aim of this study is to evaluate the diagnostic contribution of diffusion-weighted magnetic resonance imaging (MRI) and computed tomography (CT) to distinguish extramural venous invasion (EMVI) in rectal adenocarcinoma. Materials and Methods Fifty-eight patients who had been diagnosed with rectal adenocarcinoma (30 patients with EMVI and 28 patients without EMVI) were enrolled in the study. Apparent diffusion coefficient (ADC) values of the tumour and the EMVI (+) vein, the lengths of the tumours were measured on MRI. The diameters of the superior rectal vein (SRV)-inferior mesenteric vein (IMV) and distant metastatic spread were evaluated on CT. The ability of these findings to detect EMVI was assessed using receiver operating characteristic (ROC) analysis. Pathology was accepted as the reference test for EMVI. Results Mean diameters of the SRV (4.9 ± 0.9 mm vs 3.7 ± 0.8 mm) and IMV (6.9 ± 0.8 mm vs 5.4 ± 0.9 mm) were significantly larger ( P < .001) and tumour ADC values were significantly lower (0.926 ± 0.281 × 10−3 mm2/s vs 1.026 ± 0.246 × 10−3 mm2/s; P = .032) in EMVI (+) patients. Diameters of 3.95 mm for the SRV (area under the curve [AUC] ± standard error [SE]: 0.851 ± 0.051, P < .001, sensitivity: 93.3%, specificity: 67.9%) and 5.95 mm for the IMV (AUC ± SE: 0.893 ± 0.040, P < .001, sensitivity: 93.3%, specificity: 71.4%) and an ADC value of 0.929 × 10−3 mm2/s (AUC ± SE: 0.664 ± 0.072, P = .032 sensitivity: 76.7%, specificity: 57.1%) were found to be cutoff values, determined by ROC analysis, for detection of EMVI. Distant metastases were significantly more prevalent in EMVI (+) patients ( P < .001). Conclusion The measurement of ADC values and SRV-IMV diameters seems to have contribution for diagnosis of EMVI in rectal adenocarcinoma. EMVI (+) patients appear to have higher risks of distant metastases at diagnosis.

Failure of contrast enhanced computed tomography scans to identify an orbital abscess. The benefit of magnetic resonance imaging

2007 ◽  
Vol 122 (6) ◽  
pp. 639-640 ◽  
Author(s):  
D Mcintosh ◽  
M Mahadevan
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Imaging Techniques ◽  
Acute Sinusitis ◽  
Illustrative Case ◽  
Resonance Imaging ◽  
Computed Tomography Scanning ◽  
Enhanced Computed Tomography ◽  
Orbital Complications

AbstractIntroduction:Acute sinusitis is a relatively common condition, which usually responds to medical therapy. In most cases, there are no sequelae or complications subsequent to this infection. However, like many acute illnesses, there are well documented complications of acute sinusitis, and in particular these include peri-orbital and intracranial spread.Objective:The purpose of this paper is to highlight the importance of vigilance in peri-orbital involvement and the limitations of imaging techniques, such as computed tomography scanning. An illustrative case is presented to demonstrate this.Conclusion:Magnetic resonance imaging scanning is a valuable modality in assessing complex presentations of peri-orbital complications of acute sinusitis.

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