• Title/Summary/Keyword: 컴퓨터 단층 영상

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Digital approach integrating 3D facial scan and a virtual mockup for esthetic restorative treatment: A case report (심미보철 수복을 위한 3차원 안면스캔과 가상 보철물 시각화를 이용한 디지털 치료 증례)

  • Mai, Hai Yen;Choi, Yong-Do;Lee, Du-Hyeong
    • The Journal of Korean Academy of Prosthodontics
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    • v.57 no.4
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    • pp.425-431
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    • 2019
  • This clinical case report describes the digital workflow that combines a face scan, cone beam computed tomography and an intraoral scan to visualize the outcome of prosthodontic treatment in the anterior region. This approach improves communication between clinic, laboratory and patients. A patient with healthy general condition came for a restorative treatment to treat post-traumatic central incisors of maxilla. A virtual patient replica was made by incorporating a face scan, cone beam computed tomography and an intraoral scan. Design mockup of definitive restorations was shown to the patient and modified according to the patient's desire. This digital workflow facilitates the fabrication of optimal esthetic restorations, and enhances the predictability of outcome of restorations.

3-Dimensional Printing for Mesh Types of Short Arm Cast by Using Computed Tomography (전산화단층영상을 이용한 그물형 손목 부목의 3D 프린팅)

  • Seoung, Youl-Hun
    • The Journal of the Korea Contents Association
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    • v.15 no.1
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    • pp.308-315
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    • 2015
  • The purpose of this study, using 3D printer, was tried to fabricate the short arm cast of mesh types that can be hygienic and adequate ventilation with a good radiography. We used the multi channel computed tomography (MDCT) with three dimension printer device of the fused deposition modeling (FDM) techniques. The material is used a degradable plastic (poly lactic acid, PLA). Three-dimensional images of the short arm were obtained in the MDCT and then make the three-dimensional volume rendering. Three dimension volume rendering of the short arm is implemented as a tomography obtained in MDCT. Virtual mesh type cast model was output as three-dimensional images is designed based on the three-dimensional images of the short arm. As a results, the cast output by 3D printers were able to obtain excellent radiograph images than the conventional cast, and then it can decreased itching with unsanitary, and can break down easily to the cast. In conclusion, the proposed virtual mesh type cast output by 3D printers could be used as a basis for future three-dimensional printing cast productions and offered help to patients in the real life.

Fundamental Study of Relative Measurement for Accurate Measurement of Stent Size in Computed Tomography Angiography (컴퓨터단층 혈관조영술에서 스텐트 사이즈의 정확한 측정을 위한 상대적 측정법의 기초연구)

  • Lee, Seung-Young;Hong, Joo-Wan;Kang, Su-Mi;Kim, Su-Bin;Joon, Sang-Hoon;Heo, Yeong-Cheol
    • Journal of the Korean Society of Radiology
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    • v.13 no.5
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    • pp.713-720
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    • 2019
  • The purpose of this study was to propose a new measurement method for accurate measurement of vessel diameter in computed tomography angiography(CTA). CTA test was performed after non-ionic iodine contrast agent was flowed at a constant rate to self-maded perfusion phantom. After obtaining raw data, images were reconstructed with multi-planar reconstruction(MPR) and maximal intensity projection(MIP). Diameters of vascular models were measured for each technique. Relative and conventional measurements were then compared. The mean diameter of the vascular model was closer to the actual measurement when relative measurement was used compared to that when conventional measurement was used both in MPR and MIP. Relative measurements of MPR and MIP were closer to actual measurement than those of conventional measurement (34% VS, 24%, p<0.05). The relative measurement method proposed in this study was closer to the actual measurement than the conventional measurement method. However, both test methods were still larger than actual results. Therefore, further study of relative measurement method is needed using this study as basic data.

CT Evaluation of the Findings of Nutcracker Syndrome in Patients with Bladder Cancer after Radical Cystectomy and Ileal Neobladder Formation: A Correlation with Hematuria (근치적 방광적출 후 회장 신방광형성술을 시행받은 방광암 환자의 컴퓨터단층촬영: 호두까기 증후군 소견의 분석 및 혈뇨와의 관계)

  • Hae Min Shin;Joongyub Lee;Dong Hyeon Lee;Seung Hyup Kim
    • Journal of the Korean Society of Radiology
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    • v.84 no.2
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    • pp.409-417
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    • 2023
  • Purpose Patients with bladder cancer may show hematuria after radical cystectomy with ileal neobladder formation, causing anxiety regarding tumor recurrence. Here, we aim to show that the nutcracker syndrome (NCS) can be a cause of hematuria post-operation, and is a common, rather than a rare syndrome. Materials and Methods A retrospective review of contrast-enhanced abdominopelvic CT (CE-APCT) and urine analysis (UA) findings of 255 patients with bladder cancer who underwent radical cystectomy and ileal neobladder formation between 2011 and 2016 was performed. In the CE-APCT review, the left renal vein flow patterns were evaluated to determine the presence of NCS findings. In the UA review, patients were classified according to the percentage of UA tests with positive hematuria among the total number of UA tests. Results CT findings of NCS were present in 31.9% of the 135 patients. In the positive hematuria group, there were 26% more patients with NCS findings than those without. Conclusion NCS findings are prevalent even for bladder cancer patients after surgery, and there is a strong correlation between NCS findings and hematuria. Furthermore, the prevalence of NCS findings is much higher than urinary tract recurrence after the surgery.

Medical Image Compression based on Region of Interest (관심 영역에 기반한 의료 영상 압축)

  • 김희숙;임숙자
    • Proceedings of the Korea Multimedia Society Conference
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    • 2004.05a
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    • pp.228-231
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    • 2004
  • 의학 분야에서 의료 영상 데이터에 해당하는 컴퓨터 단층 찰영(CT. Computer Tomography), 자기 공명 영상법 (MRI : Magnetic Resonance Imaging)둥의 데이터 등이 정확하고 신속한 진단ㆍ관리를 위하여 의료 영상 데이터 중에서 관심의 대상이 되는 영역은 무손실 압축 기법을 수행하고, 그외의 지역은 움직임 보상 방식을 사용하여 압축하는 방식을 제안하고 실험하였다. 그 결과 기존의 손실 압축 기법에 비하여 더 낮은 비트율로 효율적인 압축을 수행하였다.

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Ectopic Adrenal Adenoma in Renal Sinus: A Case Report (신장의 이소성 부신 선종: 증례 보고)

  • John Baek;See Hyung Kim;Seung Hyun Cho;Won Hwa Kim;Hye Jung Kim;Hun Kyu Ryeom;Ghilsuk Yoon
    • Journal of the Korean Society of Radiology
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    • v.83 no.5
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    • pp.1116-1120
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    • 2022
  • The kidney is a rare site of ectopic adrenal adenoma. To the best of our knowledge, some cases of ectopic adrenal adenoma have been found in the kidney, but few of these cases explain the CT and MRI findings of the lesion. We reported a case of ectopic adrenal adenoma in the left renal sinus. A 47-year-old male patient underwent abdominal CT for routine health check-ups, which revealed a 1.2 cm enhancing mass in the left renal sinus. The MRI showed a signal drop of the mass in T1 weighted in- and opposed-phase, which indicates fat components. The mass was confirmed as an ectopic adrenal adenoma after surgery.

A Measurement Method for Cervical Neural Foraminal Stenosis Ratio using 3-dimensional CT (3차원 컴퓨터단층촬영상을 이용한 신경공 협착률 측정방법)

  • Kim, Yon-Min
    • Journal of the Korean Society of Radiology
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    • v.14 no.7
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    • pp.975-980
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    • 2020
  • Cervical neural foraminal stenosis is a very common spinal disease that affects a relatively large number of people of all ages. However, since imaging methods that quantitatively provide neural foraminal stenosis are lacking, this study attempts to present quantitative measurement results by reconstructing 3D computed tomography images. Using a 3D reconstruction software, the surrounding bones were removed, including the spinous process, transverse process, and lamina of the cervical spine so that the neural foramen were well observed. Using Image J, a region of interest including the neural foramen area of the 3D image was set, and the number of pixels of the neural foramen area was measured. The neural foramen area was calculated by multiplying the number of measured pixels by the pixel size. In order to measure the widest area of the neural foramen, it was measured between 40-50 degrees in the opposite direction and 15-20 degrees toward the head. The measured cervical neural foramen area showed consistent measurement values. The largest measured area of the right neural foramen C5-6 was 12.21 ㎟, and after 2 years, the area was measured to be 9.95 ㎟, indicating that 18% stenosis had progressed. Since 3D reconstruction using axial CT scan images, no additional radiation exposure is required, and the area of stenosis can be objectively presented. In addition, it is good to explain to patients with neural stenosis while viewing 3D images, and it is considered a good method to be used in the evaluation of the progression of stenosis and post-operative evaluation.

Computer-Aided Diagnosis for Liver Cirrhosis using Texture features Information Analysis in Computed Tomography (컴퓨터단층영상에서 TIA를 이용한 간경화의 컴퓨터보조진단)

  • Kim, Chang-Soo;Ko, Seong-Jin;Kang, Se-Sik;Kim, Jung-Hoon;Kim, Dong-Hyun;Choi, Seok-Yoon
    • The Journal of the Korea Contents Association
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    • v.12 no.4
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    • pp.358-366
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    • 2012
  • Cirrhosis is a consequence of chronic liver disease characterized by replacement of liver tissue by fibrosis, scar tissue and regenerative nodules leading to loss of liver function. Liver Cirrhosis is most commonly caused by alcoholism, hepatitis B and C, and fatty liver disease, but has many other possible causes. Some cases are idiopathic disease from unknown cause. Abdomen of liver Computed tomography(CT) is one of the primary imaging procedures for evaluating liver disease such as liver cirrhosis, Alcoholic liver disease(ALD), cancer, and interval changes because it is economical and easy to use. The purpose of this study is to detect technique for computer-aided diagnosis(CAD) to identify liver cirrhosis in abdomen CT. We experimented on the principal components analysis(PCA) algorithm in the other method and suggested texture information analysis(TIA). Forty clinical cases involving a total of 634 CT sectional images were used in this study. Liver cirrhosis was detected by PCA method(detection rate of 35%), and by TIA methods(detection rate of 100%-AGI, TM, MU, EN). Our present results show that our method can be regarded as a technique for CAD systems to detect liver cirrhosis in CT liver images.

Fractal Image Coding by Linear Transformation of Computed Tomography (전산화단층촬영의 선형변환에 의한 프랙탈 영상 부호화)

  • Park, Jae-Hong;Park, Cheol-Woo
    • Journal of the Korean Society of Radiology
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    • v.11 no.4
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    • pp.241-246
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    • 2017
  • The existing fractal compression method is effective in generating an artificial shape by approximating its partial regions to a domain block by re-dividing the whole image into a domain region and dividing it into several domain blocks, but it is difficult to implement a computer. In this study, it is difficult to approximate a complex block such as a large-sized block and an affine transformation because a large amount of calculation is required in searching for a combination of similar blocks through a transformation, so a large amount of coding time is required.

Comparison Study on Projection and Backprojection Methods for CT Simulation (투사 및 역투사 방법에 따른 컴퓨터단층촬영 영상 비교)

  • Oh, Ohsung;Lee, Seung Wook
    • Journal of radiological science and technology
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    • v.37 no.4
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    • pp.323-330
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    • 2014
  • Image reconstruction is one of the most important processes in CT (Computed tomography) technology. For fast scanning and low dose to the objects, iterative reconstruction is becoming more and more important. In the implementation of iterative reconstruction, projection and backprojection processes are considered to be indispensable parts. However, many approaches for projection and backprojection may result severe image artifacts due to their discrete characteristics and affects the reconstructed image quality. Thus, new approaches for projection and backprojection are highly demanded these days. In this paper, distance-driven approach was evaluated and compared with other conventional methods. The numerical simulator was developed to make the phantoms, and projection and backprojection images were compared using these approaches. As a result, it turned out that there are less artifacts during projection and backprojection in parallel and fan beam geometry.