• 대한핵의학회지
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• 제33권2호
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• pp.111-119
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• 1999

목적: 내측성 측두엽간질일 때 내측 측두엽의 F-l8-FDG 섭취가 감소하므로 외측 측두엽에만 F-18-FDG 섭취가 감소한 소견으로 내측성 측두엽간질과 외측성 측두엽간질을 감별할 수 있는지 조사하였다. 대상 및 방법: 113명의 측두엽간질 환자를 병리 소견과 수술 후 경과를 확인하여 내측성 측두엽간질과 외측성 측두엽간질로 나누었다. 결과: 내측성 측두엽간질을 진단하는 MR의 성능은 73% (61/83), F-18-FDG PET의 성능은 86% (70/83, p=0.014)였고 외측성 측두엽간질을 진단하는 MR의 진단성능은 66% (20/30), F-18-FDG PET의 성능은 90% (27/30, p=0.02)였다. 12명은 F-18-FBG PET소견이 정상이었다. 101명은 외측 측두엽에 대사가 감소하였고 88명은 내측 측두엽에도 대사가 감소하였으며 13명은 외측 측두엽에만 대사가 감소하였다. F-18-FDG PET에 내측 측두엽에 대사가 감소하였다는 소견으로 내측성 측두엽간질임을 예측하는 예측률은 88% (70/88)였고 F-18-FDG PET에 외측 측두엽만 대사가 감소되었고 내측 측두엽은 대칭으로 보인다는 소견으로 외측성 측두엽간질을 진단하는 성능은 69% (9/13)였다. 결론: F-18-FDG PET에 내측 측두엽 대사가 감소하지 않고 외측 측두엽만 대사가 감소한 것을 보고 외측성 측두엽간질임을 감별할 수 있었다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권5호
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• pp.1713-1718
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• 2012

Advanced imaging approaches (computed tomography, CT; magnetic resonance imaging, MRI; $^{18}F$-fluorodeoxyglucose positron emission tomography, FDG PET) have increased roles in cervical cancer staging and management. The recent FIGO (International Federation of Gynecology and Obstetrics) recommendations encouraged applications to assess the clinical extension of tumors rather than relying on clinical examinations and traditional non-cross sectional investigations. MRI appears to be better than CT for primary tumors and adjacent soft tissue involvement in the pelvis. FDG-PET/CT has increased in usage with a particular benefit for whole body evaluation of tumor metabolic activity. The potential benefits of advanced imaging are assisting selection of treatment based upon actual disease extent, to adequately treat a tumor with minimal normal tissue complications, and to predict the treatment outcomes. Furthermore, sophisticated external radiation treatment and brachytherapy absolutely require advanced imaging for target localization and radiation dose calculation.

• Investigative Magnetic Resonance Imaging
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• 제13권1호
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• pp.101-105
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• 2009

저자들은 육종의 일종으로 분류되는 유방의 악성 엽상종양이 골격근으로 전이된, 현재까지 영상소견으로는 보고된 사례가 없는, 드문 증례의 초음파, 양전자방출 단층촬영, 전산화 단층 촬영, 자기공명영상 소견을 보고하고자 한다.

• Journal of Yeungnam Medical Science
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• 제40권4호
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• pp.435-441
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• 2023

Pheochromocytomas and paragangliomas (PPGLs) may secrete hormones or bioactive neuropeptides such as interleukin-6 (IL-6), which can mask the clinical manifestations of catecholamine hypersecretion. We report the case of a patient with delayed diagnosis of paraganglioma due to the development of IL-6-mediated systemic inflammatory response syndrome (SIRS). A 58-year-old woman presented with dyspnea and flank pain accompanied by SIRS and acute cardiac, kidney, and liver injuries. A left paravertebral mass was incidentally observed on abdominal computed tomography (CT). Biochemical tests revealed increased 24-hour urinary metanephrine (2.12 mg/day), plasma norepinephrine (1,588 pg/mL), plasma normetanephrine (2.27 nmol/L), and IL-6 (16.5 pg/mL) levels. ¹⁸F-fluorodeoxyglucose (FDG) positron emission tomography/CT showed increased uptake of FDG in the left paravertebral mass without metastases. The patient was finally diagnosed with functional paraganglioma crisis. The precipitating factor was unclear, but phendimetrazine tartrate, a norepinephrine-dopamine release drug that the patient regularly took, might have stimulated the paraganglioma. The patient's body temperature and blood pressure were well controlled after alpha-blocker administration, and the retroperitoneal mass was surgically resected successfully. After surgery, the patient's inflammatory, cardiac, renal, and hepatic biomarkers and catecholamine levels improved. In conclusion, our report emphasizes the importance of IL-6-producing PPGLs in the differential diagnosis of SIRS.

• Nuclear Medicine and Molecular Imaging
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• 제42권6호
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• pp.444-450
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• 2008

목적 : 이 연구에서는 암병력이 없는 무증상 건강인을 대상으로 $^{18}F-FDG$ PET의 암 선별검사로서의 유용성에 대하여 알아보고자 하였다. 대상 및 방법: 2000년 1월부터 2005년 12월까지 삼성서울병원 건강의학센터에서 건강 검진 프로그램중의 하나로 시행된 $^{18}F-FDG$ PET 검사 2,021건을 연구 대상으로 하였다. 종양 유무에 최종 진단은 건강 검진 프로그램에 포함된 다른 검사, 추가적인 진단 검사, 병리진단 결과 또는 1년 이상의 임상적 추적관찰을 통하여 정해졌다. 결과: 대상군에서 40건(2.0%)의 악성 종양이 최종적으로 진단되었다. $^{18}F-FDG$ PET에서는 악성 종양중 21건(전체 대상의 1.0%)이 발견되었다. PET으로 진단된 암의 42.9%(9/21)는 다른 건강 건진 프로그램에서 발견하지 못한 암이었다. 악성 종양을 진단하는 $^{18}F-FDG$ PET검사의 민감도는 52.5%(21/40), 특이도 95.9%(1900/1981), 양성 예측도 20.6%(21/102), 음성 예측도 99.0%(1900/1919)로 측정되었다. $^{18}F-FDG$ PET 위음성(n=19)을 보인 암은 갑상선 암이 6건으로 가장 많은 부분을 차지하고 있었고, 결장함과 전립선암이 각각 3건, 폐암과 위암이 각각2건, 방광암과 악성 흑색종(malignant melanoma), 직장암이 각각 1건이었다. 결론 : $^{18}F-FDG$ PET은 아주 높은 특이도와 음성 예측도로 인하여 악성 종양을 발견하는 암 선별검사로서 유용한 것으로 보인다. 그렇지만, $^{18}F-FDG$ PET은 비뇨 부인과계 종양, 당대사가 낮은 종양과 표재성 종양 발견에 민감도가 떨어지므로 단독보다는 다른 암 선별검사와 함께 시행하는 것이 유용하다.

• Nuclear Medicine and Molecular Imaging
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• 제42권5호
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• pp.414-418
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• 2008

간암의 정맥계 침범은 흔하나 심장 침범은 드물고 예후가 불량할 뿐 아니라 급사의 위험이 있다. 본 증례처럼 간세포암이 혈관계를 통해 우심방까지 전이된 경우 노작성 호흡곤란 같은 심부전에 의한 증상을 나타낼 수 있어서 간세포암의 간외 전이를 의심하기는 쉽지 않고, 원발 병소를 찾기 위해서 여러 가지 진단적 검사를 시행하여야 한다. F-18 FDG PET/CT는 기능적으로 암세포의 당대사 항진을 3차원적인 입체 영상으로 국소화하기 때문에 비침습적이며 경제적으로 간세포암의 침범 및 간외전이를 쉽게 확인할 수 있다. 저자들은 호흡곤란을 주소로 내원한 55세 남자 환자에서 PET/CT를 통해서 간세포암과 간세포암의 우심방 침범을 진단하는데 도움을 받았기에 이를 문헌고찰과 함께 보고하는 바이다.

• Korean Journal of Radiology
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• 제24권1호
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• pp.51-61
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• 2023

Objective: To develop and test a machine learning model for classifying human papillomavirus (HPV) status of patients with oropharyngeal squamous cell carcinoma (OPSCC) using ¹⁸F-fluorodeoxyglucose (¹⁸F-FDG) PET-derived parameters in derived parameters and an appropriate combination of machine learning methods in patients with OPSCC. Materials and Methods: This retrospective study enrolled 126 patients (118 male; mean age, 60 years) with newly diagnosed, pathologically confirmed OPSCC, that underwent ¹⁸F-FDG PET-computed tomography (CT) between January 2012 and February 2020. Patients were randomly assigned to training and internal validation sets in a 7:3 ratio. An external test set of 19 patients (16 male; mean age, 65.3 years) was recruited sequentially from two other tertiary hospitals. Model 1 used only PET parameters, Model 2 used only clinical features, and Model 3 used both PET and clinical parameters. Multiple feature transforms, feature selection, oversampling, and training models are all investigated. The external test set was used to test the three models that performed best in the internal validation set. The values for area under the receiver operating characteristic curve (AUC) were compared between models. Results: In the external test set, ExtraTrees-based Model 3, which uses two PET-derived parameters and three clinical features, with a combination of MinMaxScaler, mutual information selection, and adaptive synthetic sampling approach, showed the best performance (AUC = 0.78; 95% confidence interval, 0.46-1). Model 3 outperformed Model 1 using PET parameters alone (AUC = 0.48, p = 0.047) and Model 2 using clinical parameters alone (AUC = 0.52, p = 0.142) in predicting HPV status. Conclusion: Using oversampling and mutual information selection, an ExtraTree-based HPV status classifier was developed by combining metabolic parameters derived from ¹⁸F-FDG PET/CT and clinical parameters in OPSCC, which exhibited higher performance than the models using either PET or clinical parameters alone.

• Korean Journal of Radiology
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• 제24권11호
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• pp.1142-1150
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• 2023

Objective: To evaluate ^99mtechnetium-three polyethylene glycol spacers-arginine-glycine-aspartic acid (^99mTc-3PRGD₂) single-photon emission computed tomography (SPECT)/computed tomography (CT) imaging for diagnosing lymph node metastasis of primary malignant lung neoplasms. Materials and Methods: We prospectively enrolled 26 patients with primary malignant lung tumors who underwent ^99mTc-3PRGD₂ SPECT/CT and ¹⁸F-fluorodeoxyglucose (¹⁸F-FDG) positron emission tomography (PET)/CT imaging. Both imaging methods were analyzed in qualitative (visual dichotomous and 5-point grades for lymph nodes and lung tumors, respectively) and semiquantitative (maximum tissue-to-background radioactive count) manners for the lymph nodes and lung tumors. The performance of the differentiation of lymph nodes with and without metastasis was determined at the per-lymph node station and per-patient levels using histopathological results as the reference standard. Results: Total 42 stations had metastatic lymph nodes and 136 stations had benign lymph nodes. The differences between metastatic and benign lymph nodes in the visual qualitative and semiquantitative analyses of ^99mTc-3PRGD₂ SPECT/CT and ¹⁸F-FDG PET/CT were statistically significant (all P < 0.001). The area under the receiver operating characteristic curve (AUC) in the semi-quantitative analysis of ^99mTc-3PRGD₂ SPECT/CT was 0.908 (95% confidence interval [CI], 0.851-0.966), and the sensitivity, specificity, positive predictive value, and negative predictive value were 0.86 (36/42), 0.88 (120/136), 0.69 (36/52), and 0.95 (120/126), respectively. Among the 26 patients (including two patients each with two lung tumors), 15 had pathologically confirmed lymph node metastasis. The difference between primary lung lesions in patients with and without lymph node metastasis was statistically significant only in the semi-quantitative analysis of ^99mTc-3PRGD₂ SPECT/CT (P = 0.007), with an AUC of 0.807 (95% CI, 0.641-0.974). Conclusion: ^99mTc-3PRGD₂ SPECT/CT imaging may notably perform in the direct diagnosis of lymph node metastasis of primary malignant lung tumors and indirectly predict the presence of lymph node metastasis through uptake in the primary lesions.

• Asian Pacific Journal of Cancer Prevention
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• 제16권15호
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• pp.6279-6284
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• 2015

Opisthorchis viverrini (OV)-induced cholangiocarcinoma (CCA) is an important cancer in the Great Mekong region, particularly in Thailand. Limitations of treatment options and the lack of an effective diagnostic tool for early detection of CCA are major concerns for the control of this type of cancer. The aim of the study was to investigate anti-CCA activity of the ethanolic extract of Atractylodes lancea (Thunb.) DC., and the applicability of positron emission tomography-computed tomography (PET-CT) as a tool for detection and monitoring the progression of CCA in Opisthorchis viverrini (OV)/dimethylnitrosamine (DMN)-induced CCA hamsters. Male Syrian hamsters were used for toxicity tests and anti-CCA activity evaluation. Development of CCA was induced by initial feeding of 50 metacercariae of OV, followed by drinking water containing 12.5 ppm of DMN in hamsters. The ethanolic extract of A. lancea (Thunb.) DC. was administered orally for 30 days. PET-CT was performed every 4 weeks after initiation of CCA using 18F-fluorodeoxyglucose ($^{18}F-FDG$). Results from the present study suggest that the ethanolic extract of A. lancea (Thunb.) DC. rhizome exhibited promising anti-CCA activity and safety profile in the OV/DMN-induced hamster model. To successfully apply PET-CT as a tool for early detection of tumor development and progression, modification of radiolabeling approach is required to improve its specificity for CCA cells.

• Korean Journal of Radiology
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• 제22권9호
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• pp.1497-1513
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• 2021

The diagnostic and treatment methods of multiple myeloma (MM) have been rapidly evolving owing to advances in imaging techniques and new therapeutic agents. Imaging has begun to play an important role in the management of MM, and international guidelines are frequently updated. Since the publication of 2015 International Myeloma Working Group (IMWG) criteria for the diagnosis of MM, whole-body magnetic resonance imaging (MRI) or low-dose whole-body computed tomography (CT) and ¹⁸F-fluorodeoxyglucose positron emission tomography/CT have entered the mainstream as diagnostic and treatment response assessment tools. The 2019 IMWG guidelines also provide imaging recommendations for various clinical settings. Accordingly, radiologists have become a key component of MM management. In this review, we provide an overview of updates in the MM field with an emphasis on imaging modalities.