• Journal of Digital Convergence
• /
• v.13 no.1
• /
• pp.331-339
• /
• 2015

The purpose of this study is to evaluate utility of rotating adjustment using Xsight spine tracking system in 3D DOF location adjusting method, to minimize error between 6D DOF and 3D DOF in fiducial tracking system. In this study, the result of 6D DOF target location error is $0.124{\pm}0.058mm$, using fiducial inside tumor 3D DOF $0.673{\pm}0.142mm$, outside tumor $1.126{\pm}0.253mm$, apply with Xsight spine tracking system 3D DOF $0.542{\pm}0.103mm$. As the experiment shows, it was demonstrated that rotating adjustment through Xsight spine tracking system is valuable in case of treatment in 3D DOF location error that makes increasing accuracy and dose distribution each approximately 48% and 3%. In accordance with result of this study is useful rotation.

• Proceedings of the Korean Society of Veterinary Pathology Conference
• /
• 2002.11a
• /
• pp.38-50
• /
• 2002

질병의 정확한 진단과 적절한 치료 그리고 이에 대한 연구를 위해서는 병소에서 채취한 검체의 형태학적 소견을 관찰하는 것이 중요하다. 이러한 형태학적 변화를 관찰하기 위해서, 연구자들은 생검 조직으로 제작한 헤마톡실린-에오신 염색표본을 이용하고 있으며, 필요한 경우에는 세포의 미세구조를 관찰하기 위하여 전자현미경 검색을 시행하고 있다. 그러나, 각종질환은 점차 세분화되고, 새로운 진단기준이 소개되고 있으며, 종양의 진단에 도움을 주는 종양표지자, 그리고, 예후를 판정할 수 있는 예후인자들이 알려지고 있어서, 통상적인 헤마톡실린-에오신 염색표본이나 전자현미경 검색만으로는 이러한 종합적인 정보를 얻기가 어렵다. (중략)

• Nuclear Medicine and Molecular Imaging
• /
• v.43 no.6
• /
• pp.557-564
• /
• 2009

Purpose: To evaluate the relationship between F-18 FDG uptake of tumor in PET/CT scan and pathological or immunohistochemial parameters of colorectal cancer. Materials and Methods: 147 colorectal cancer patients who underwent both pre-operative F-18 FDG PET/CT scan and surgery were included. In cases with perceptible FDG uptake in primary tumor, the maximum standardized uptake value (SUVmax) was calculated. The pathologic results such as site, size, depth of invasion (T stage), growth pattern, differentiation of primary tumor, lymph node metastasis and Dukes-Astler & Coller stage and immunohistochemical markers such as expression of EGFR, MLH1, MSH2 and Ki-67 index were reviewed. Results: 146 out of 147 PET/CT scans with colorectal cancer showed perceptible focal FDG uptake. SUVmax showed mild positive linear correlation with size of primary tumor (r=0.277, p=0.001) and Ki-67 index (r=0.226, p=0.019). No significant difference in F-18 FDG uptake was found according to site, depth of invasion (T stage), growth pattern, differentiation of primary tumor, presence of lymph node metastasis, Dukes-Astler & Coller stage and expression of EGFR. Conclusion: The degree of F-18 FDG uptake in colorectal cancer was associated with the size and the degree of Ki-67 index of primary tumor. It could be thought that FDG uptake of primary tumor has a correlation with macroscopic and microscopic tumor growth.

• The Korean Journal of Nuclear Medicine
• /
• v.39 no.1
• /
• pp.26-33
• /
• 2005

Purpose: The purpose of this study is to evaluate migration of technetium-99m hexamethylpropylene amine oxime ($^{99m}Tc$-HMPAO) labeled immature and mature dendritic cells (DC) in the mouse. Methods: DC were collected from bone marrow (BM) of tibiae and femurs of mice. Immature and mature DC from BM cells were radiolabeled with $^{99m}Tc$-HMPAO. To evaluate the functional and phenotypic changes of DC from radiolabeling, the allogeneic mixed lymphocyte reaction (MLR) and fluorescence-activated cell sorting (FACS) analysis were performed before and after labeling with $^{99m}Tc$-HMPAO. Migration of intravenously injected DC (iv-DC) was assessed by serial gamma camera images of mice with or without subcutaneous tumor. Percent injected dose per gram (%ID/g) was calculated in lungs, liver, spleen, kidneys, and tumor through dissection of each mice after 24 hours of injection. Results: Labeling efficiency of immature and mature DC were $60.4{\pm}5.4%\;and\;61.8{\pm}6.7%$, respectively. Iv-DC initially appeared in the lungs, then redistributed mainly to liver and spleen. Migration of mature DC to spleen was significantly higher than that of immature DC ($38.3{\pm}4.0%\;vs.\;32.2{\pm}4.1%$ in control group, $40.4{\pm}4.1%\;vs.\;35.9{\pm}3.8%$ in tumor group; p<0.05). Migration to tumor was also significantly higher in mature DC than in immature DC ($2.4{\pm}0.3%\;vs\;1.7{\pm}0.2%$; p=0.034). Conclusion: Assessment of migration pattern of DC in mice was possible using $^{99m}Tc$-HMPAO labeled immature and mature DC. Migration of mature DC to spleen and tumor was higher than that of immature DC when they were i.v. injected.

• Journal of Digestive Cancer Research
• /
• v.4 no.1
• /
• pp.32-35
• /
• 2016

Pseudomyxoma peritonei (PMP) is a rare clinical syndrome characterized by profuse jelatinous materials in the abdominal cavity and pelvis with mucinous implants on the peritoneal surface. There are some studies for serum tumor markers, including carcinoembryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9) and carbohydrate antigen 125 (CA125), to assess the risk of recurrence following cytoreductive surgery and intraperitoneal chemotherapy. However, rare cases were reported about recurrence with increasing serum CEA levels. Herein, we report a case of recurrence of PMP according to serially elevated serum CEA.

• The Korean Journal of Nuclear Medicine
• /
• v.27 no.2
• /
• pp.285-292
• /
• 1993

Avidin과 biotin의 높은 결합력을 이용하여 종양 영상을 개선하는 방법이 많이 연구되고 있다. 본 실험에서는 이러한 목적으로 쓰기 위하여 적당한 $^{99m}Tc$ 표지 avidin을 제조하였다. Avidin을 표지하기 위하여 우선 $^{99m}Tc$과 안정한 킬레이트를 형성할 수 있는 benzoylmercaptoacetyltriglycine (Bz-MAG3)과 biocytin을 화학적으로 결합시킨 Bz-MAG3-biocytin을 합성하였다. 이 화합물을 Tc-99m으로 표지시켜 avidin 또는 streptavidin을 1:1로 섞어 줌으로서 Tc-99m으로 표지된 avidin과 streptavidin을 제조하였다. 이들의 생쥐 생체내 분포를 조사한 결과 avidin의 경우 높은 간(56.6%, 10min)과 신장(28.5%, 10min) 축적을 보였고 streptavidin의 경우 높은 신장 축적 (28.9%, 21hr)을 보였다. Avidin의 높은 정상 조직 축적을 줄이기 위하여 succinic acid를 결합시켜 등전점(pI)을 낮춘 다음 같은 실험을 하여 본 결과 신장 축적율은 pI가 $7.0{\sim}9.3,\;5.5{\sim}6.2,\;4.0{\sim}4.8$로 낮아졌을 경우 19.0%, 3.1%, 1.7%로 각각 떨어졌지만 간에의 축적은 pI 변화에 따른 상관성을 찾아 볼 수가 없었다. 체내 제거율을 측정하여 본 결과 pI를 변화시킨 avidin과 변화시키지 않은 avdin들은 반감기가 13.5에서 16.0시간 사이로 큰 차이점을 보이지 않았는데 streptavidin은 반감기 61.5시간 정도로 느리게 제거된다는 것을 알았다. 이 실험의 결과 1. Avidin을 $^{99m}Tc$-MAG3-biocytin으로 안정하게 표지할 수 있었고, 2. pI가 낮아진 avidin은 신장에의 축적율이 크게 감소되었으며, 3. $^{99m}Tc$으로 표지된 avidin과 streptavidin은 먼저 간으로 흡수된 후 대사된 다음 신장으로 배설된다는 사실을 알았다.

• 대한핵의학회:학술대회논문집
• /
• 2003.11a
• /
• pp.15.2-15.2
• /
• 2003

• 대한핵의학회:학술대회논문집
• /
• 2005.11a
• /
• pp.319.1-319.1
• /
• 2005

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2005.05a
• /
• pp.323-323
• /
• 2005

• The Korean Journal of Nuclear Medicine
• /
• v.34 no.3
• /
• pp.243-251
• /
• 2000

Purpose: This prospective study was performed to evaluate the usefulness of preoperative radioimmunoscintigraphy and intraoperative scintimetric examination (radioimmunoguided surgery: RIGS) using $^{99m}Tc-anti-CEA\;F(ab')_2$ fragment. Materials and Methods: Nineteen patients with rectal cancer underwent preoperative whole body planar scintigraphy at 4 hours after injection of $^{99m}Tc-anti-CEA\;F(ab')_2$ fragment and SPECT imaging at 18 hours. Surgical operation was performed at 24 hours after injection. During laparotomy, radioactivities from intraabdominal viscera were measured by gamma probe. The radioactivities from excised tumor and lymph nodes were also measured and compared with pathology. Results: All nineteen patients were confirmed to have adenocarcinomas in the rectum. Twenty-seven of 97 excised lymph node groups had metastasis and 2 patients had liver metastasis in pathology Preoperative radioimmunoscintigraphy detected primary tumors in 11 patients (sensitivity 55%) and it could not detect any lymph nodes or liver metastasis. All patients showed high radioactivity in the kidneys, liver, spleen, and major vessels in intraoperative measurement by gamma probe, and tumor activity was not discriminated from background activity However, radioactivity from excised tumor was higher than normal rectum (T/B ratio; $3.47{\pm}2.25$). When excised lymph node activity/background activity ratio >1.5 was considered as positive criteria of metastasis, sensitivity, specificity, positive and negative predictive values were 78.6%, 73.9%, 55.0% and 89.5%, respectively. Conclusion: Radioimmunoscintigraphy using $^{99m}Tc-anti-CEA\;F(ab')_2$ has no additional value for preoperative staging and use of early RIGS using $^{99m}Tc-anti-CEA\;F(ab')_2$ is inappropriate. For early RIGS using $^{99m}Tc$ labeled antibodies in rectal cancer patients, further development of more specific antibodies and methods to reduce background activity are needed.