The impact of self-regulation strategies on student success and satisfaction in an online course

The purpose of this study was to examine whether students’ self-regulation skills impact their success and satisfaction in an online learning environment. Data was collected from one hundred and fifty-five students taking an online introductory programming course offered as a part of certification curriculum in a public university in Turkey. The Online Self-regulation and Learning Questionnaire was used to gather learners’ skills in four main sub-components of self-regulation namely planning, help seeking, time management, and self-evaluation. The results indicated that self-regulation, specifically planning, as an important factor for explaining student success and satisfaction in an online course. © 2017, Association for the Advancement of Computing in Education. All rights reserved

The impact of self-regulation strategies on student success and satisfaction in an online course

The purpose of this study was to examine whether students’ self-regulation skills impact their success and satisfaction in an online learning environment. Data was collected from one hundred and fifty-five students taking an online introductory programming course offered as a part of certification curriculum in a public university in Turkey. The Online Self-regulation and Learning Questionnaire was used to gather learners’ skills in four main sub-components of self-regulation namely planning, help seeking, time management, and self-evaluation. The results indicated that self-regulation, specifically planning, as an important factor for explaining student success and satisfaction in an online course. © 2017, Association for the Advancement of Computing in Education. All rights reserved

Multiparametric imaging for detection and characterization of hepatocellular carcinoma using gadoxetic acid-enhanced MRI and perfusion-CT: which parameters work best?

Abstract Background MRI and perfusion-CT (PCT) are both useful imaging techniques for detection and characterization of liver lesions. The aim of this study was to compare the diagnostic accuracy of imaging parameters derived from PCT and gadoxetic acid-enhanced MRI in patients with hepatocellular carcinoma (HCC). Methods 36 patients with liver cirrhosis and a total of 67 lesions referred to our hospital for multi-parametric diagnosis of HCC-suspected liver lesions in the setting of liver cirrhosis were prospectively enrolled and underwent PCT and MRI. HCC diagnosis was confirmed either by histology (n = 60) or interval growth (n = 7). For PCT, mean/max blood flow (BF), blood volume (BV), k-trans, arterial liver perfusion (ALP), portal venous perfusion (PVP) and hepatic perfusion index (HPI) were quantified. Two readers identified the lesions based on single maps each being blinded to the number of lesions. MRI-protocol included fat-suppressed T1w-VIBE sequences obtained before, 2, 5, 10 and 20 min after the injection of gadoxetic acid as well as non-enhanced coronal HASTE, axial T1w-VIBE, fat-suppressed T2w-TSE and DWI. Quantitative analysis was performed using enhancement ratios between tumor and liver parenchyma for post-contrast in the hepatobiliary phase (RIRHB), arterial (ERa) and late-venous (ERv) phases as well as signal intensity ratios (liver/parenchyma) on T1w (RIRT1) and T2w (RIRT2). Results In PCT analysis, all lesions exhibited high BFmax values (63–250 mL/100 g tissue) and were visible on HPI maps with high degrees of arterial blood supply of (HPI > 96%). In MRI, RIRHB was negative in 8/67. 12/67 HCCs were missed on DWI. 46/67 HCCs showed wash-in and 47/67 HCC showed wash-out of contrast agent. 6/67 HCCs were missed on T1w and 11/67 were missed on T2w-sequences when analyzed separately, while analysis of multiparametric MRI combining typical enhancement pattern, visibility on hepatobiliary phase and T1w-images the same number of lesions as PCT irrespective of their size (1–19 cm) were detected. Quantification of early enhancement by ERa or ERv did not improve detection rates. Conclusions Perfusion-CT and gadoxetic acid-enhanced MRI were comparable in detecting HCC lesions. For PCT a mean HPI > 96% proved to be a very robust parameter for detection and characterization of HCC