• Title/Summary/Keyword: Radiological fusion science

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Usefulness of CT based SPECT Fusion Image in the lung Disease : Preliminary Study (폐질환의 SPECT와 CT 융합영상의 유용성: 초기연구)

  • Park, Hoon-Hee;Kim, Tae-Hyung;Shin, Ji-Yun;Lee, Tae-Soo;Lyu, Kwang-Yeul
    • Journal of radiological science and technology
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    • v.35 no.1
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    • pp.59-64
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    • 2012
  • Recently, SPECT/CT system has been applied to many diseases, however, the application is not extensively applied at pulmonary disease. Especially, in case that, the pulmonary embolisms suspect at the CT images, SPECT is performed. For the accurate diagnosis, SPECT/CT tests are subsequently undergoing.However, without SPECT/CT, there are some limitations to apply these procedures. With SPECT/CT, although, most of the examination performed after CT. Moreover, such a test procedures generate unnecessary dual irradiation problem to the patient. In this study, we evaluated the amount of unnecessary irradiation, and the usefulness of fusion images of pulmonary disease, which independently acquired from SPECT and CT. Using NEMA PhantomTM (NU2-2001), SPECT and CT scan were performed for fusion images. From June 2011 to September 2010, 10 patients who didn't have other personal history, except lung disease were selected (male: 7, female: 3, mean age: $65.3{\pm}12.7$). In both clinical patient and phantom data, the fusion images scored higher than SPECT and CT images. The fusion images, which is combined with pulmonary vessel images from CT and functional images from SPECT, can increase the detection possibility in detecting pulmonary embolism in the resin of lung parenchyma. It is sure that performing SPECT and CT in integral SPECT/CT system were better. However, we believe this protocol can give more informative data to have more accurate diagnosis in the hospital without integral SPECT/CT system.

Feasibility study of improved median filtering in PET/MR fusion images with parallel imaging using generalized autocalibrating partially parallel acquisition

  • Chanrok Park;Jae-Young Kim;Chang-Hyeon An;Youngjin Lee
    • Nuclear Engineering and Technology
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    • v.55 no.1
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    • pp.222-228
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    • 2023
  • This study aimed to analyze the applicability of the improved median filter in positron emission tomography (PET)/magnetic resonance (MR) fusion images based on parallel imaging using generalized autocalibrating partially parallel acquisition (GRAPPA). In this study, a PET/MR fusion imaging system based on a 3.0T magnetic field and 18F radioisotope were used. An improved median filter that can set a mask of the median value more efficiently than before was modeled and applied to the acquired image. As quantitative evaluation parameters of the noise level, the contrast to noise ratio (CNR) and coefficient of variation (COV) were calculated. Additionally, no-reference-based evaluation parameters were used to analyze the overall image quality. We confirmed that the CNR and COV values of the PET/MR fusion images to which the improved median filter was applied improved by approximately 3.32 and 2.19 times on average, respectively, compared to the noisy image. In addition, the no-reference-based evaluation results showed a similar trend for the noise-level results. In conclusion, we demonstrated that it can be supplemented by using an improved median filter, which suggests the problem of image quality degradation of PET/MR fusion images that shortens scan time using GRAPPA.

Performance Evaluation of the Developed Diagnostic Multi-Leaf Collimator and Implementation of Fusion Image of X-ray Image and Infrared Thermography Image (개발한 진단용 다엽조리개 성능평가 및 X선영상과 적외선체열영상의 융합영상 구현)

  • Kwon, Soon-Mu;Shim, Jae-Goo;Chon, Kwon-Su
    • Journal of radiological science and technology
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    • v.42 no.5
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    • pp.365-371
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    • 2019
  • We have developed and applied a diagnostic Multi-Leaf Collimator (MLC) to optimized the X-ray field in medical imaging and the usefulness evaluated through the fusion of infrared image and X-ray image acquired by infrared camera. The hand and skull radiography with multi-leaf collimator(MLC) showed significant area dose reductions of 22.9% and 31.3% compared to ARC and leakage dose was compliant with KS A 4732. Also scattering doses of 50 cm and 100 cm showed a significant decrease to confirm the usefulness of MLC. It was confirmed that the fusion of infrared images with an adjustable degree of transparency was possible in the X-ray images. Therefore, fusion of anatomical information with physiological convergence is expected to contribute and improvement of diagnostic ability. In addition, the feasibility of convergence X-ray imaging and DITI devices and the possibility of driving MLC with infrared images were confirmed.

A study on the usefulness of a fusion model designed cloak shield to reduce the radiation exposure of the assistant during CT of severely injured patient (중증외상환자 CT 검사 시 검사보조자의 방사선피폭 경감을 위한 융합적 망토 차폐체의 유용성 연구)

  • Seo, Sun-Youl;Han, Man-Seok;Kim, Chang-Gyu;Jeon, Min-Cheol;Kim, Yong-Kyun;Kim, Gab-Jung
    • Journal of the Korea Convergence Society
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    • v.8 no.9
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    • pp.211-216
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    • 2017
  • The purpose of this study is to evaluate the usefulness of a newly fusion model designed cloak shield to reduce the radiation exposure of the assistant during CT(computed tomography) of severely injured patient. Radiation dose was measured in the heart, both axillary and thyroid areas using newly designed cloak shield and existing shield with head phantom and human phantom under the same conditions as brain vascular CT scan. The newly designed cloak shield was measured higher for radiation shielding rate than the existing shields, 61.9 % for heart, 46.2 % for left axillary, 69.8 % for right axillary and 71.1 % for thyroid gland, respectively. a newly developed fusion model of cloak shields are useful for reducing radiation exposure. It is expected to make a significant contribution to reduction of radiation exposure.

Imaging Findings of Renal Cell Carcinoma Associated with Xp11.2 Translocation/TFE3 Gene Fusion in a 4-Year-Old Male: Case Report and Review of Literature (4세 남아에서 발견된 Xp11.2 염색체 재배열/TFE3 유전자 융합 연관 신세포 암의 영상 소견: 증례보고 및 문헌고찰)

  • Kim, Hyun Gi;Lee, Mi-Jung;Lee, Sarah;Kim, Myung-Joon;Hong, Chang Hee
    • Investigative Magnetic Resonance Imaging
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    • v.17 no.1
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    • pp.41-46
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    • 2013
  • We represent a pathologically proven case of a four-year-old male patient with renal cell carcinoma associated with Xp11.2 translocation/TFE3 gene fusion, which is rare but more frequent in children or young adults. Computed tomography showed about 2.5 cm size ill-defined mass in the right kidney. The mass was hyperechoic on ultrasound. Magnetic resonance imaging demonstrated a mass with capsular enhancement and diffusion restriction. We present a case of Xp11.2 renal cell carcinoma and provide review of the literature.

CT and MRI Image Fusion Reproducibility and Dose Assessment on Treatment Planning System (치료계획시스템에서 전산화단층촬영과 자기공명영상의 영상융합 재현성 및 선량평가)

  • Choi, Jae-Hyock;Park, Cheol-Soo;Seo, Jeong-Min;Cho, Jae-Hwan;Choi, Cheon-Woong
    • Journal of the Korean Magnetics Society
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    • v.24 no.6
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    • pp.191-196
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    • 2014
  • The purpose of this study is to evaluate the reproducibility and usefulness of an image through the fusion of the computed tomography image and the magnetic resonance image by using a self-produced phantom when planning the treatment, and also to compare and analyze the target dose on the acquired image. The size of small hole and the reproducibility of capacity existed in the phantom on the image of the phantom obtained by the computed tomography and the magnetic resonance image of the phantom scanning with different intensity of magnetic field are compared, and the change of dose in the random target is compared and analyzed.

Analysis on exhibits for nuclear energy of science museums (원자력을 주제로 하는 과학관 전시물에 대한 분석)

  • Lee, Gui-Won;Yang, Han-Joon
    • Korean Journal of Digital Imaging in Medicine
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    • v.15 no.2
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    • pp.25-30
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    • 2013
  • The purpose of this study was to provide information about exhibits for nuclear energy in science museums. This analysed form and content of exhibits of science museums. The subjects were exhibits of 3 science museums; Seoul science park, Seoul national science museum, Gwachen national science museum. The research results were as follows: First, 3 science museums had similar methods of exhibits and types of explanations because of speciality of theme. 3 science museums had mostly fixed exhibit. Panel was the most types of explanations in 3 science museums. Second, 3 science museums had similar contents of exhibits. They dealt with nuclear power generation and radiation. However, Some parts such as radioactive waste, nuclear fusion generation had different. This study suggests that exhibits for nuclear energy of science museums use a variety of methods and types of explanation. Also, science museums need to increase exhibits for nuclear energy.

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Evaluation of Usefulness for Diagnosis of Lung Cancer on Integrated PET-MRI Using Decision Matrix (판정행렬을 기반한 일체형 PET-MRI의 폐암 진단 유용성 평가)

  • Kim, Jung-Soo;Yang, Hyun-Jin;Kim, Yoo-Mi;Kwon, Hyeong-Jin;Park, Chanrok
    • Journal of radiological science and technology
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    • v.44 no.6
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    • pp.635-643
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    • 2021
  • The results of empirical researches on the diagnosis of lung cancer are insufficient, so it is limited to objectively judge the clinical possibility and utilization according to the accuracy of diagnosis. Thus, this study retrospectively analyzed the lung cancer diagnostic performance of PET-MRI (Positron Emission Tomography-Magnetic Resonance Imaging) by using the decision matrix. This study selected and experimented total 165 patients who received both hematological CEA (Carcinoembryonic Antigen) test and hybrid PET-MRI (18F-FDG, 5.18 MBq/kg / Body TIM coil. VIVE-Dixon). After setting up the result of CEA (positive:>4 ㎍/ℓ. negative:<2.5㎍/ℓ) as golden data, the lung cancer was found in the image of PET-MRI, and then the SUVmax (positive:>4, negative:<1.5) was measured, and then evaluated the correlation and significance of results of relative diagnostic performance of PET-MRI compared to CEA through the statistical verification (t-test, P>0.05). Through this, the PET-MRI was analyzed as 96.29% of sensitivity, 95.23% of specificity, 3.70% of false negative rate, 4.76% of false positive rate, and 95.75% of accuracy. The false negative rate was 1.06% lower than the false positive rate. The PET-MRI that significant accuracy of diagnosis through high sensitivity and specificity, and low false negative rate and false positive rate of lung cancer, could acquire the fusion image of specialized soft tissue by combining the radio-pharmaceuticals with various sequences, so its clinical value and usefulness are regarded as latently sufficient.

Development of the Upper Wear Fixation Device for Chest AP X-ray Imaging on the Emergency Stretcher Bed (응급실 침대 위 흉부전후방향 엑스선 검사를 위한 상의고정장치 개발)

  • Lim, Woo-Taek;Hong, Dong-Hee
    • Journal of radiological science and technology
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    • v.45 no.3
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    • pp.205-211
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    • 2022
  • This study aimed to provide basic data for 3D printing in the medical health field by developing upper wear fixation device (UWFD), an auxiliary device for shortening chest AP examination time on emergency room beds and non-contact with patients. The standard of hooks was modeled according to the bed frame using the Autodesk Fusion 360. It was printed with Form2 (Formlabs, Somerville, MA, USA), as SLA (stereo lithography apparatus) method, and was washed and hardened using Form Wash and Form Cure. The completed UWFD conducted an online survey on 4 items of stability, convenience, availability, preference and general characteristics. The total stability average was 3.93±0.80, the total convenience average was 3.93±0.68, the total availability average was 4.01±0.89, and the total preference average was 3.80±1.08. This study was significant in suggesting improvements in the general X-ray examination process in the emergency room by designing and making aids to easily fixing the patient's top to the frame of the emergency bed while meeting promptness and non-contact with the patient.