Earticle

본 연구에서는 female adult mesh (FASH) 팬텀으로부터 획득한 CT 영상에 FNLM 알고리즘을 적용하여 유사도를 분석하고자 한다. 먼저, GATE (geant4 application for tomographic emission) 프로그램을 이용하여 FASH의 전신 CT 스캔 데이터를 모델링한 뒤 그 데이터로부터 MATLAB 프로그램을 통해 442 × 256 사이즈의 CT axial 영상을 획득하였다. 그리고 획득한 원본 이미지에 표준편차 0.002를 가지는 가우시안 노이즈를 부가함으로서 Noisy 이미지를 획득한 뒤 그 이미지에 fast non-local means (FNLM) 알고리즘을 가중치 조절 인자 h를 0.05로 적용하였다. 본 연구에서는 유사도를 평가하기 위하여 평균 제곱근 편차 (Root Mean Square Error, RMSE)와 최대 신호 대 잡음비 (Peak Signal-to-noise ratio, PSNR)를 사용하였다. 원본이미지와 FNLM 알고리즘이 적용된 영상과의 유사도를 평가 한 결과, 원본이미지와 노이즈 이미지의 유사도에 비하여 RMSE 수치는 1.45배 향상되었으며, PSNR 수치는 1.04배 향상되었다. 결론적으로 FNLM 알고리즘은 영상을 복원하는데 효과가 있음이 증명되었다.

In this study, we analyzed the similarity about image applied fast non-local means (FNLM) algorithm to CT images obtained from the female adult mesh (FASH) phantom. First, full-body CT scan data of the FASH was modeled using the genant4 application for tomographic emission (GATE) program, and from that data, a 442 × 256 CT axial image was obtained through the MATLAB program. Subsequently, a noisy image was obtained by adding Gaussian noise with a standard deviation of 0.002 to the acquired original image and the FNLM algorithm which has 0.05 weight was applied to the image. In this study, root mean square error (RMSE) and peak signal-to-noise ratio (PSNR) were used to evaluate the similarity. As a result of evaluating the similarity between the original image and the image with FNLM algorithm, the RMSE level was 1.45 times and PSNR level was 1.04 times higher than the noisy image. In conclusion, we demonstrated that the FNLM algorithm can restore efficiently the noisy images.

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.

최근 방사선차폐시트는 제조공정에서 제품의 유연성 확보와 경도를 방지하기 위해 고분자 수지와의 배합을 많이 선 택한다. 배합과정은 기존의 납과 고무의 배합과정에서 벗어난 고분자 수지의 선택은 차폐물질의 분산에 문제점을 안고 있다. 텅스텐과 같은 금속물질인 경우는 더 어려운 과정이 다. 따라서 본 연구과정은 나노화과정이 아닌 첨가제를 이용 하여 이 문제를 해결하고자 한다. 가소제를 사용하여 차폐물질인 텅스텐을 고분자 수지 내의 혼합성을 높여 분산력에 영향을 주고 그 결과 차폐능의 변화가 있는지 조사하였다. 그 결과 작은 차이이지만, 분산력에 영향을 주어 차폐능의 변화를 보였다. 따라서 본 실험결과 가소제는 방사선차폐시트의 유연성과 수지내의 분산력을 확보하는 동시에 충전률 을 높여 차폐능을 개선하였다.

Patients who had claustrophobia tend to feel fear when they were scanned by an MRI, CT, PET-CT, or using a gamma camera scan. In this paper, claustrophobic patients were tested to find effective ways by changing patient's positions. For this paper, PET-CT scan in patients who had claustrophobia were used in the prone position. Prone position helped to maintain stable position and to get a h0igh quality of inspection without failure. Thus, as claustrophobic patients were requested taking prone position, they could feel comfortable. In a confined space, prone position for the claustrophobic patients who had a fear of the PET-CT examination would be expected to reduce the failure rate of inspection.

This study, was conducted to find out the correlation factors of anxiety of the patients during MRI exam on the claustrophobia. This study conducted a survey targeting those korea auxiliary police and combat auxiliary police patients who were admitted to the National Police Hospital over a period from January 2 to December 24, 2013 to investigate their degree of claustrophobia. In study result, sufficient explain before exam was helpful and decrease anxiety. However, they felt more anxious about limited spare, and when the entered a bore. Symptoms of instability and fear were stuffy, sweat, dyspnea, palpitation those are ascending rank of frequency.