Liver segmentation in MRI: a fully automatic method based on stochastic partitions

There are few fully automated methods for liver segmentation in magnetic resonance images (MRI) despite the benefits of this type of acquisition in comparison to other radiology techniques such as computed tomography (CT). Motivated by medical requirements, liver segmentation in MRI has been carried out. For this purpose, we present a new method for liver segmentation based on the watershed transform and stochastic partitions. The classical watershed over-segmentation is reduced using a marker-controlled algorithm. To improve accuracy of selected contours, the gradient of the original image is successfully enhanced by applying a new variant of stochastic watershed. Moreover, a final classifier is performed in order to obtain the final liver mask. Optimal parameters of the method are tuned using a training dataset and then they are applied to the rest of studies (17 datasets). The obtained results (a Jaccard coefficient of 0.91 +/- 0.02) in comparison to other methods demonstrate that the new variant of stochastic watershed is a robust tool for automatic segmentation of the liver in MRI. (C) 2014 Elsevier Ireland Ltd. All rights reserved.This work has been supported by the MITYC under the project NaRALap (ref. TSI-020100-2009-189), partially by the CDTI under the project ONCOTIC (IDI-20101153), by Ministerio de Educacion y Ciencia Spain, Project Game Teen (TIN2010-20187) projects Consolider-C (SEJ2006-14301/PSIC), "CIBER of Physiopathology of Obesity and Nutrition, an initiative of ISCIII" and Excellence Research Program PROMETEO (Generalitat Valenciana. Conselleria de Educacion, 2008-157). We would like to express our gratitude to the Hospital Clinica Benidorm, for providing the MR datasets and to the radiologist team of Inscanner for the manual segmentation of the MR images.López-Mir, F.; Naranjo Ornedo, V.; Angulo, J.; Alcañiz Raya, ML.; Luna, L. (2014). Liver segmentation in MRI: a fully automatic method based on stochastic partitions. Computer Methods and Programs in Biomedicine. 114(1):11-28. https://doi.org/10.1016/j.cmpb.2013.12.022S1128114

Assessment of gastrointestinal stromal tumors with computed tomography following treatment with imatinib mesylate

AIM: To evaluate and characterize the patterns of disease progression of metastatic or unresectable gastrointestinal stromal tumor (GIST) treated with imatinib mesylate, and to determine the prognostic significance associated with disease progression

การกระจายตัวของใยบะซอลต์ในสารละลายDispersion of Basalt Fibers in Solution

การศึกษาการกระจายตัวของเส้นใยบะซอลต์ในสารละลายเพื่อหาสภาวะที่เหมาะสมในการกระจายตัวของเส้นใยบะซอลต์ การเลือกใช้เส้นใยบะซอลต์เป็นอีกทางเลือกหนึ่งในการลดการใช้แร่ใยหินซึ่งเป็นอันตรายต่อร่างกายแต่จากการนำไปใช้งานในวัสดุก่อสร้างพบปัญหาเรื่องการเกาะกลุ่มของเส้นใยบะซอลต์ การศึกษาการกระจายตัวจะสามารถช่วยแก้ปัญหาที่เกิดขึ้นได้ มีการวัดค่าความต้านทานไฟฟ้าและค่าความขุ่นของสารละลาย ซึ่งเป็นค่าบ่งบอกถึงการกระจายตัวของเส้นใยบะซอลต์ ในการทดลองเปรียบเทียบอัตราส่วนเส้นใยบะซอลต์ต่อน้ำพบว่า ที่ปริมาณเส้นใยบะซอลต์ 1 เปอร์เซ็นต์โดยมวล เส้นใยจะมีการกระจายตัวดีที่สุด สารกระจายตัวคาร์บอกซีเมทิลเซลลูโลสสามารถช่วยให้เส้นใยบะซอลต์กระจายตัวได้ดีขึ้น พบว่าที่พีเอชและสัดส่วนของสารช่วยกระจายตัวเดียวกัน คาร์บอกซีเมทิลเซลลูโลสจะให้ค่าความต้านทานไฟฟ้าต่ำกว่าการเติมลาเท็กซ์ ในกรณีคาร์บอกซีเมทิลเซลลูโลสที่พีเอชของสารละลายเท่ากับห้า เจ็ด และเก้า ค่าความต้านทานไฟฟ้ามีค่าใกล้เคียงกันมากA study of basalt fibers dispersion in solution was to find the suitable conditions of dispersion. Using basalt fibers is the other way to decrease asbestos which is dangerous for human health. The problem of using basalt fibers in construction material was agglomeration of fibers. The investigation of dispersion can solve this problem. This work measured the electrical resistivity and turbidity of solution which were the indicator of basalt fibers dispersion. The comparison of various ratio of basalt fibers and water found that at 1% by weight the dispersion was good. Carboxy Methyl Cellulose (CMC) improved the dispersion. At the same pH and ratio of dispersant, the electrical resistivity of CMC was lower than of latex. pH at 5, 7 and 9 did not affect to the electrical resistivity as using CMC

The association between the outcomes of extraperitoneal laparoscopic radical prostatectomy and the anthropometric measurements of the prostate by magnetic resonance imaging

<div><p>ABSTRACT Introduction and objective To determine the association between the anthropometric measurements by magnetic resonance imaging (MRI) and perioperative outcomes of extraperitoneal laparoscopic radical prostatectomy (ELRP). Materials and Methods From 2008 to June 2016, 86 patients underwent preoperative MRI prior to undergoing ELRP for localized prostate cancer. We analyzed the associations between anthropometric measurements of MRI and the perioperative outcomes of patients who underwent ELRP. Results The mean patient age was 69.61±8.30 years. The medians of operating time and blood loss were 2.30 hours and 725.30ml, respectively. The total post-surgical complication rate was 1.16%. The median hospital stay was 6.50 days. The pathological stages for T2 and T3 were 45.74% and 34.04%, respectively. The rate as positive surgical margins (PSMs) was 18.09% (pT2 and pT3; 6.38% and 9.57%). The angles between pubic bone and prostate gland (angle 1&2), were significantly associated with operative time and hospital stay, respectively (p<0.05). There was no correlation between the pelvimetry and positive surgical margin. Conclusions The findings of the present study suggest that anthropometric measurements of the MRI are related to operative difficulties in ELRP. This study confirmed that MRI planning is the key to preventing complications in ELRP.</p></div

The association between the outcomes of extraperitoneal laparoscopic radical prostatectomy and the anthropometric measurements of the prostate by magnetic resonance imaging

ABSTRACT Introduction and objective To determine the association between the anthropometric measurements by magnetic resonance imaging (MRI) and perioperative outcomes of extraperitoneal laparoscopic radical prostatectomy (ELRP). Materials and Methods From 2008 to June 2016, 86 patients underwent preoperative MRI prior to undergoing ELRP for localized prostate cancer. We analyzed the associations between anthropometric measurements of MRI and the perioperative outcomes of patients who underwent ELRP. Results The mean patient age was 69.61±8.30 years. The medians of operating time and blood loss were 2.30 hours and 725.30ml, respectively. The total post-surgical complication rate was 1.16%. The median hospital stay was 6.50 days. The pathological stages for T2 and T3 were 45.74% and 34.04%, respectively. The rate as positive surgical margins (PSMs) was 18.09% (pT2 and pT3; 6.38% and 9.57%). The angles between pubic bone and prostate gland (angle 1&2), were significantly associated with operative time and hospital stay, respectively (p<0.05). There was no correlation between the pelvimetry and positive surgical margin. Conclusions The findings of the present study suggest that anthropometric measurements of the MRI are related to operative difficulties in ELRP. This study confirmed that MRI planning is the key to preventing complications in ELRP