Earticle

Purpose: This study intended to propose an expert system for diagnosing fatty liver. Methods: 20 image samples taken from four ultrasonic equipments in Seoul·Incheon Medical Examination Center between Jan. 4, 2016 and Oct. 15, 2016, were selected as the objects of the study. For each image sample, the interested area of hepatic parenchyma in 2nd zone of right subcostal scans were measured three times. The regions of hepatic parenchyma and renal parenchyma in right subcostal longitudinal scanning were measured in the same way in which, the digitized RGB average image from B-mode through measuring with Caleb program algorithm was analyzed. Result: The analyzed result showed that in multiple logistic regression analysis(p<0.05), the average brightness ratio of hepatic and renal parenchyma’s echo was 4.25 times higher in mild, 6.05 times higher in moderate, and 7.67 times higher in severe degree than the one of normality. It indicates a meaningful value that shows more fatty liver results in greater gap between the brightness ratios of hepatic and renal parenchyma. Conclusions: Visual analogue fatty liver scale is expected to serve as a supplementary indicator to objectively diagnose fatty liver.

The aim of this study was to measure the sharpness of tip and cannula of needle of Automated Gun Biopsy, to find out the difference. Accuracy was measured using AIKOH Electric Push-Pull Standard Model MV-600N2, and 3mm thick silicon was used to reproduce the toughness of human skin. The needle part of the four automatic biopsy guns used in this hospital was cut and tested. The automatic biopsy guns used in the experiment are all 18G, and the cannula part which role of the tissue by covering the appearance of obturator needle and obturator needle with true cut method. is integrated. The average value was obtained from experiments which were performed on each needle 5 times in total, the unit was designated N. As a result, the sharpness of tip was more than 3N, and the degree of sharpness was higher in order of A → C → D → B. Cannula had degree of sharpness in the order of D → C → A → B and showed sharpness close to 1N. C and B products had the same order of sharpness of tip and cannula part, and A and D showed different sharpness. In conclusion, this study measured only the sharpness of four automatic biopsy guns, but it is necessary to study the operation method of the main body, safety, convenience of operation and to experiment various automatic biopsy guns of various manufacturers.

The purpose of this study is a new process study for reducing patient waiting time in simple X-ray imaging. For this study, we analyzed the data of patients who underwent X-ray examination at the regular time from August 1 to 31, 2017 in N hospital in Seoul, and discovered new process based on the analysis value. A new process was introduced to acquire data from August 1 to 31, 2018, and the waiting time between two data was compared and analyzed. In study result, the introduction of the new process reduced the wait time for inspection by 54 seconds(p<0.05). In conclusion, it may be used as a reference for related research and work by proposing a new process that can be considered for special hospitals of the same level or similar type in patient placement.

This study is to provide clinical data when neck soft x-ray was carried out about pediatric who did not communicate by applying self-development jaw lift device. This study were conducted in a subject of 23 children who examined neck soft x-ray from 2017 September 7 to October 20 at our hospital. Two group time which were carried out neck soft x-ray with device and without device were measured. also, Image of two group were evaluated. Evaluation data obtained by measuring the average difference were analyzed by independent-t-test . After apply self-development-jaw-lift-device, time was reduced by 26.5%(38.9sec). the results indicated significant differences(p<.05). Image evaluation was increase 42.08%(1.01point), It was statistically highly significant difference (p<.01). If apply self-development-jaw-lift-device in pediatric neck soft x-ray, operator can provide fast, convenience, high quality image to pediatric.

Different R-R intervals over cardiac cycles can affect the volume data and stair-step artifacts (SSA) could be developed. However, it could be detected even in CT images obtained using the data from the same R-R intervals. We thus hypothesized cradle sagging during the scan could affect the development of SSA. CT scan of pulsating cardiac phantom with straight artificial vessels was performed using 64 MDCT in retrospective ECG gating. Both the phantom and 10-60kg standard weights at 10 kg intervals were placed on the cradle. CT images were obtained at the three different points with the movement of the cradle, within the similar locations of the heart at a feet-first protocol. Tilt angles of the cradle were measured using a digital inclinometer and scanned phantom. The presence of SSA was assessed by two independent radiologists using curved multi-planar reconstructed (MPR) images. Tilt angles at each point showed statistically significant correlation with the increased weights on the cradle (r=0.91, 0.97 and 0.88 at each point, P< 0.05). Moreover, SSA were perceived more in the CT images obtained at the cradle with higher tilt angle. In rotated vertically curved MPR images, sagittal images showed more severe SSA than coronal images. Tilt angle of the cradle showed significant correlation with the weights of phantom, and SSA were noted more when higher tilt angle was detected. To reduce SSA, cradle sagging should be minimized to avoid the tilting of the cradle which might affect the CT volume data.

A hypothesis was set up that there is an exponential change of image quality according to the patient's body fat thickness and contrast iodine content in the CT scan, but that there must be a certain saturation section. A method to reduce the side effects of the patients was analyzed through experiments while maintaining diagnostic value by using a contrast agent with low iodine content in the saturation region based on the previous studies where patients' side effects increased as the iodine content got higher. The soft algorithm was applied to CT scanner (120 kVp, 200 mAs, 5 ㎜ slice) to change phantom fat thickness (0, 2, 3.5, 5 ㎝) and contrast iodine content (300, 320, 350, 370 ㎎) followed by 10 scans for each condition. The images obtained by the experiment were analyzed by using the image analyzer (Image J). After setting the area of interest in the liver, the contrast medium and surrounding area, the mean and standard deviation were measured, the SNR and CNR results obtained through which were analyzed statistically (SPSS.) and the significance was verified. Contrast agent SNR and CNR were not significantly different between 300 ㎎ and 320 ㎎ (p=0.36), and 350 ㎎ and 370 ㎎ (p=0.15) of contrast content for the fat thickness of 0 ㎝; there was no difference between 300 ㎎ and 320 ㎎ (p=0.11) for 2 ㎝ but there was a difference between 350 ㎎ and 370 ㎎ (p>0.00). There was no effect of contrast agent on liver SNR (p>0.05), and the SNR by fat thickness decreased exponentially. There was a significant difference in CNR for both fat thickness and contrast agent content (p<0.00). The use of 300 ㎎ of contrast medium in the case of dry or obese patients or 350 ㎎ for the effect of contrast media can reduce the adverse effects of the patients and obtain images of diagnostic value. In addition, various contents of contrast medium can be selectively used in patients with normal body shape.

The purpose of this study is to provide the optimal information for patients and MRI users by understanding the spectrum by each physical principle of MRS and each disease based on the factors affecting magnetic resonance spectroscopy. As for data analysis, this study randomly selected the patients with a brain disease in the data transmitted to PACS after magnetic resonance spectroscopy(MRS) and conducted ananalysis with MRS. As the factors that affect MRS, chemical shift, j-coupling, decoupling, eddy current and water suppression were used, and for a spectrum analysis of each disease, All data were tested, using 3.0 T MRI equipment and the applied pulse sequence was PRESS technique. :As a result of the analysis of the spectrum of the metabolites, Gliomas decreases at an NAA peak of 2.01 ppm while choline (3.22 ppm) and lactate/lipids increased at 1.3 ppm (p=0.000). In necrotic tumor and abscess, lactate increased in both lesions, and in abscess, a peak was obtained at which acetate (1.9 ppm) and alanine (1.5 ppm) increased (p=0.000). In conclusion, this spectrum analysis could understand the physical principle of the factors affecting MRS and find the distribution of the spectra of the metabolites by each disease.