• Title/Summary/Keyword: CT (computed tomography)

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A Case Report on Extranodal Marginal Zone B Cell of Mucosa-associated Lymphoid Tissue (MALT) Type Lymphoma Treated with Hangam-dan (항암단을 투여 받은 림프절 외 변연부 B세포 림프종 환자에 대한 증례보고)

  • Han, Sung-Soo;Cho, Chong-Kwan;Lee, Yeon-Weol;Yoo, Hwa-Seung
    • The Journal of Internal Korean Medicine
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    • v.29 no.3
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    • pp.810-818
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    • 2008
  • Objective : The aim of this case report is to drive further studies evaluating the effectiveness of Korean oriental medicine on extranodal marginal zone B cells of MALT (mucosa-associated lymphoid tissue) type lymphoma. Methods : This case report is about a patient who was diagnosed with extranodal marginal zone B cell of MALT type lymphoma, who refused chemotherapy and preferred to be treated with Korean oriental medicine. Neck, chest abdomen & pelvis with enhanced computed tomography (CT) and positron emission tomography computed tomography (PET-CT) were performed to evaluate the anticancer effect of Hangam-dan (HAD). Results : The patient diagnosed with MALT showed partial response after receiving 17 months of Korean oriental medical treatment. Neck, chest, abdomen & pelvic CT and PET-CT show decrease in size. Conclusion : This case report shows a possibility that Korean oriental treatment could offer potential benefits for patients with extranodal marginal zone B cell of MALT type lymphoma.

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Primary Pelvic Peritoneal Yolk Sac Tumor in the Post-Pubertal Female: a Case Report with Literature Review

  • Kim, Myojeong;Lee, Eun Ji;Hwang, Jiyoung;Hong, Seong Sook;Chang, Yun-Woo;Oh, Eunsun;Nam, Bo Da;Choi, Inho;Kim, Jeong Sig
    • Investigative Magnetic Resonance Imaging
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    • v.23 no.4
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    • pp.367-373
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    • 2019
  • Yolk sac tumors are rare malignant germ cell neoplasms that usually arise from the gonads. Extragonadal yolk sac tumors (EGYSTs) frequently occur in the mediastinum in post-pubertal females. EGYSTs in the pelvis are extremely rare, and to date, only thirteen cases have been reported in the English literature. Among them, the primary EGYST of the pelvic peritoneum in post-pubertal females has only been reported in ten cases. The present case describes a 26-year-old female diagnosed with primary peritoneal yolk sac tumor located in the rectouterine pouch. We report clinical and tumor imaging features, including ultrasound, computed tomography (CT), magnetic resonance images (MRI), positron emission tomography-computed tomography (PET-CT), and present a review of the literature.

A Case Report on the Patient of Malignant Melanoma at Right Maxilla with the Treatment of Bee Venom Phamacopuncture (봉독약침을 시행한 우측상악동의 악성 흑색종 환자에 대한 증례보고)

  • Bang, Sun-Hwi;Yoo, Hwa-Seung
    • Journal of Pharmacopuncture
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    • v.10 no.2 s.23
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    • pp.99-105
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    • 2007
  • Objectives : It is the aim of this study to derive lurker studies evaluating the effectiveness of bee-venom phamacopuncture on malignant melanoma patients. We present a patient of malignant melanoma at right maxilla who survives over one year with stable disease (SD) by the treatment of Bee Venom Phamacopuncture (BVP). Methods : We followed the treatment and examination. We prescribed to the patient what to be taken 1.5cc BVP once a day. Picture series, Head series were followed-up and Neck computed tomography (CT) and positron emission tomography computed tomography (PET CT) were performed to evaluate the therapeutic efficacy. Results : The patient survives over one year and continued stable disease over 6 months. Picture series, Head series X-ray, neck CT and PET CT were shown no interval change. Conclusion : This case may give us the possibility that BVP offers potential benefits for patients with malignant melanoma.

Evaluation and Comparison of Contrast to Noise Ratio and Signal to Noise Ratio According to Change of Reconstruction on Breast PET/CT (Breast PET CT 영상 재구성 변화에 따른 대조도 대 잡음비와 신호 대 잡음비의 비교평가)

  • Lee, Jea-Young;Lee, Eul-Kyu;Kim, Ki-Won;Jeong, Hoi-Woun;Lyu, Kwang-Yeul;Park, Hoon-Hee;Son, Jin-Hyun;Min, Jung-Whan
    • Journal of radiological science and technology
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    • v.40 no.1
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    • pp.79-85
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    • 2017
  • The purpose of this study was to measure contrast to noise ratio (CNR) and signal to noise ratio (SNR) according to change of reconstruction from region of interest (ROI) in breast positron emission tomography-computed tomography (PET-CT), and to analyze the CNR and SNR statically. We examined images of breast PET-CT of 100 patients in a University-affiliated hospital, Seoul, Korea. Each patient's image of breast PET-CT were calculated by using ImageJ. Differences of CNR and SNR among four reconstruction algorithms were tested by SPSS Statistics21 ANOVA test for there was statistical significance (p<0.05). We have analysis socio-demographical variables, CNR and SNR according to reconstruction images, 95% confidence according to CNR and SNR of reconstruction and difference in a mean of CNR and SNR. SNR results, with the quality of distributions in the order of PSF_TOF, Iterative and Iterative-TOF, FBP-TOF. CNR, with the quality of distributions in the order of PSF_TOF, Iterative and Iterative-TOF, FBP-TOF. CNR and SNR of PET-CT reconstruction methods of the breast would be useful to evaluate breast diseases.

Patient radiation dose and protection from cone-beam computed tomography

  • Li, Gang
    • Imaging Science in Dentistry
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    • v.43 no.2
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    • pp.63-69
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    • 2013
  • After over one decade development, cone beam computed tomography (CBCT) has been widely accepted for clinical application in almost every field of dentistry. Meanwhile, the radiation dose of CBCT to patient has also caused broad concern. According to the literature, the effective radiation doses of CBCTs in nowadays market fall into a considerably wide range that is from $19{\mu}Sv$ to $1073{\mu}Sv$ and closely related to the imaging detector, field of view, and voxel sizes used for scanning. To deeply understand the potential risk from CBCT, this report also reviewed the effective doses from literatures on intra-oral radiograph, panoramic radiograph, lateral and posteroanterior cephalometric radiograph, multi-slice CT, and so on. The protection effect of thyroid collar and leaded glasses were also reviewed.

Rupturing Anterior Communicating Artery Aneurysm during Computed Tomography Angiography : Three-Dimensional Visualization of Bleeding into the Septum Pellucidum and the Lateral Ventricle

  • Kim, Ealmaan
    • Journal of Korean Neurosurgical Society
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    • v.55 no.6
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    • pp.357-361
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    • 2014
  • Computed tomography angiography (CTA) is commonly used in setting of subarachnoid hemorrhage, but imaging features of aneurysm rupturing taking place at the time of scanning has rarely been described. The author reports a case of actively rebleeding aneurysm of the anterior communicating artery with intraventricular extravasation on the hyperacute CTA imaging. The rebleeding route, not into the third ventricle but into the lateral ventricles, can be visualized by real-time three-dimensional CT pictures. The hemorrhage broke the septum pellucidum and the lamina rostralis rather than the lamina terminalis.

Basic principle of cone beam computed tomography (Cone beam형 전산화단층영상의 원리)

  • Choi Yong-Suk;Kim Gyu-Tae;Hwang Eui-Hwan
    • Imaging Science in Dentistry
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    • v.36 no.3
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    • pp.123-129
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    • 2006
  • The use of computed tomography for dental procedures has increased recently. Cone beam computed tomography (CBCT) systems have been designed for imaging hard tissues of the dentomaxillofacial region. CBCT is capable of providing high resolution in images of high diagnostic quality. This technology allows for 3-dimensional representation of the dentomaxillofacial skeleton with minimal distortion, but at lower equipment cost, simpler image acquisition and lower patient dose. Because this technology produces images with isotropic sub-millimeter spatial resolution, it is ideally suited for dedicated dentomaxillofacial imaging. In this paper, we provide a brief overview of cone beam scanning technology and compare it with the fan beam scanning used in conventional CT and the basic principles of currently available CBCT systems.

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New evolution of cone-beam computed tomography in dentistry: Combining digital technologies

  • Jain, Supreet;Choudhary, Kartik;Nagi, Ravleen;Shukla, Stuti;Kaur, Navneet;Grover, Deepak
    • Imaging Science in Dentistry
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    • v.49 no.3
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    • pp.179-190
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    • 2019
  • Panoramic radiographs and computed tomography (CT) play a paramount role in the accurate diagnosis, treatment planning, and prognostic evaluation of various complex dental pathologies. The advent of cone-beam computed tomography (CBCT) has revolutionized the practice of dentistry, and this technique is now considered the gold standard for imaging the oral and maxillofacial area due to its numerous advantages, including reductions in exposure time, radiation dose, and cost in comparison to other imaging modalities. This review highlights the broad use of CBCT in the dentomaxillofacial region, and also focuses on future software advancements that can further optimize CBCT imaging.

Usability Evaluation of Applied Low-dose CT When Examining Urinary Calculus Using Computed Tomography (컴퓨터 단층촬영을 이용한 요로결석 검사에서 저선량 CT의 적용에 대한 유용성 평가)

  • Kim, Hyeon-Jin;Ji, Tae-Jeong
    • The Journal of the Korea Contents Association
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    • v.17 no.6
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    • pp.81-85
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    • 2017
  • The aim of this study was to evaluate the usability of applied Low dose Computed Tomography(LDCT) protocol in examining urinary calculus using computed tomography. The subjects of this study were urological patients who visited a medical institution located in Busan from June to December 2016 and the protocol used in this study was Adaptive Statistical Iterative Reconstruction: low-dose CT with 50% Adaptive Statistical Iterative Reconstruction (ASIR). As results of quantitative analysis, the mean pixel value and standard deviation within kidney region of image(ROI)of the axial image were $26.21{\pm}7.08$ in abdomen CT pre scan and $20.03{\pm}8.16$ in low-dose CT. Also the mean pixel value and standard deviation within kidney ROI of the coronal image were $22.07{\pm}7.35$ in abdomen CT pre scan and $21.67{\pm}6.11$ in low dose CT. The results of qualitative analysis showed that four raters' mean values of observed kidney artifacts were $19.14{\pm}0.36$ when using abdomen CT protocol and $19.17{\pm}0.43$ in low-dose CT, and the mean value of resolution and contrast was $19.35{\pm}0.70$ when using abdomen CT protocol and $19.29{\pm}0.58$ in low-dose CT. Also the results of a exposure dose analysis showed that the mean values of CTDIvol and DLP in abdomen CT pre scan were 18.02 mGy and $887.51mGy{\cdot}cm$ respectively and the mean values of CTDIvol and DLP when using low-dose CT protocol were 7.412 mGy and $361.22mGy{\cdot}cm$ respectively. The resulting dose reduction rate was 58.82% and 59.29%, respectively.

Evaluation of the Low Tube Voltage in the Computed Tomography Scan Technique using a Low Concentration Contrast Agent (저농도 조영제를 사용한 CT검사에서 저관전압 기법에 따른 유용성 평가)

  • Jung, Kang-Kyo;Cho, Pyong-Kon
    • Journal of radiological science and technology
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    • v.39 no.1
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    • pp.71-79
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    • 2016
  • The purpose of this study is computed tomography contrast agent at low concentrations and low tube voltage technique to evaluate the usefulness on the phantom image. By varying the degree of mixture by the contrast medium concentration it was inserted in phantom. It was taken by changing the tube voltage and tube current step by step, and to evaluate the dose and the CT value obtained from the phantom image. As a result, low-contrast, low tube voltage(300 mgI/ml, 100 kV) was reduced by an average 21%(CTDIvol; computed tomography dose indexvol) more standard condition(350 mgI/ml, 120 kV). SNR was increased at all depths of the phantom, respectively 1:10 and 1:20(by diluting a contrast agent and normal saline) 12.2(26%) 6.2(17%). CNR was increased at all depths of the phantom, respectively 1:10 and 1:20(by diluting a contrast agent and normal saline) 11.5(32%), 6.3(26%). Research work on the CT scan is necessary in a variety of studies on the low contrast concentration and low tube voltage techniques for dose reduction and reducing of side effects the contrast agent.