Document Type : Research Article
Liver volumetric analysis has become a significant means in medical practice. Volume of the liver is mainly calculated by organ segmentation of Magnetic Resonance Image (MRI) and Computed Tomography (CT) images. The purpose of this article is to deliver an open summary of liver division for radiotherapists and additional health care experts. By means of MRI and CT images, this article surveys signals for liver segmentation. This paper also deals with the technical methods used in computer program for segmentation along with the evolving part of liver segmenting in medical procedures. Liver division for volume evaluation is specified before a major hepatectomy, portal vein embolization, Associating liver partition and portal vein ligation for staged hepatectomy(ALPPS) and transplantation. Segmentation software can be classified into manual, semi-automated and fully automated based on the quantity of operator input. Segmentation done manually is measured as the goldenbenchmark in medical procedure and study, but is tiresome and takes a lot of time. Although highly automated methods for segmentation are reliable, they may have some segmentation drawbacks. New methods for segmentation comprise combination of operation arrangement and MRI-dependent biomarkers. Liver division is widely used in medical operations and has a wide range of developing opportunities. Medical officials can have better results in their medical practice for volumetric measurements by using semi-automatic or fully automatic segmentation methods. Depending on the techniques used with CT and MRI images accuracy of 90-92%, 91-96%, 95-98% are observed in manual, semi-automated and fully automated segmentation respectively.