Deep Learning in MR Motion Correction:a Brief Review and a New Motion Simulation Tool (view2Dmotion)

With the development of deep-learning techniques, the application of deep learning in MR imaging processing seems to be growing. Accordingly, deep learning has also been introduced in motion correction and seemed to work as well as do conventional motion-compensation methods. In this article, we review the motion-correction methods based on deep learning, focusing especially on the motion-simulation methods adopted. We then propose a new motion-simulation tool, which we call view2Dmotion.

Deep Learning in MR Motion Correction:a Brief Review and a New Motion Simulation Tool (view2Dmotion)

With the development of deep-learning techniques, the application of deep learning in MR imaging processing seems to be growing. Accordingly, deep learning has also been introduced in motion correction and seemed to work as well as do conventional motion-compensation methods. In this article, we review the motion-correction methods based on deep learning, focusing especially on the motion-simulation methods adopted. We then propose a new motion-simulation tool, which we call view2Dmotion.

A Case of Choroidal Metastasis of Pancreatic Carcinoma

Metastatic tumor to the eye is the most common type of intraocular malignancy. The most common primary site of the intraocular metastatic tumor is the breast in women and the lung in men respectively and the choroid is by far the most common site for intraocular metastasis. We experienced a case of chroidal metastasis in a patient with pancreatic carcinoma which is not published in Korea. So, we review that case with the literatures related with metastatic pancreatic cancer to the choroid.

A Case of Choroidal Metastasis of Pancreatic Carcinoma

Metastatic tumor to the eye is the most common type of intraocular malignancy. The most common primary site of the intraocular metastatic tumor is the breast in women and the lung in men respectively and the choroid is by far the most common site for intraocular metastasis. We experienced a case of chroidal metastasis in a patient with pancreatic carcinoma which is not published in Korea. So, we review that case with the literatures related with metastatic pancreatic cancer to the choroid.

Comparision of central Corneal Endotherial Cell Density with Peripheral Areas According to Age by Specular Microscopy

We measured corneal endothelial cell density of 100 normal eyes of 50 Korean volunteers on central, superior, inferior, nasal and temporal aspect, respectively. Non-contact specular microscopy were used for measurement. The data thus obteined were analyzed according to the following parameters: age, laterality, sex and location(central vs. peripheral). Corneal endothelial cell density showed gradual decrement with age, but no significant statistically differences with laterality and sex. The results showed a large difference in corneal endothelial cell density depending on the location, although they failed to show statistical significant(P>0.05).

The Effects of Unpreserved Lidocaine on the Corneal Endothelium during Cataract Surgery

Recently, intracameral injection of 1% unperserved lidocaine was intro-duced as a supplement to the topical anesthesia in cataract operations. We evaluated the effect of intracameral lidocaine on the corneal endothelium. One hundred eyes of 90 patients undergone scleral tunnel incision and phacoemulsification with posterior chamber intraocular lens implantation were divided into 2 group according to the methods of anesthesia. Topical anesthesia with intracameral injection of 0.2 of 1% unpreserved lidocaine was used to the 50 eyes of 45 patients[group 1] and pinpoint anestesia to the rest[group 2]. Specular microscopy using non-contact specular microscope was done preoperatively, 1 week, 1 month and 3 months postoperatively to compare the endothelial morphologic changes between the 2 groups. The reduction of central corneal endothelial cell density at 3 months postoperatively was 9.45% in Group 1 and 8.74% in Group 2. The difference between the 2 groups was not significant statistically[p>0.1]. Postoperative changes in coefficient of variation[polymegathism] and hexagonality[pleomorphism] were not significantly different between the 2 groups either[p>0.1]. We therefore concluded that intracameral injection of 1% unpreserved lidocaine does not adversely affect the corneal endothelial cell function and morphology and may safely be used as a supplement to topical anesthesia in cataract surgeries.