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  1. No Access

    Article

    Distinct subtypes of spatial brain metabolism patterns in Alzheimer’s disease identified by deep learning-based FDG PET clusters

    Alzheimer’s disease (AD) is a heterogeneous disease that presents a broad spectrum of clinicopathologic profiles. To date, objective subty** of AD independent of disease progression using brain imaging has b...

    Hyun Gee Ryoo, Hongyoon Choi, Kuangyu Shi… in European Journal of Nuclear Medicine and M… (2024)

  2. Article

    Open Access

    Deep learning signature of brain [18F]FDG PET associated with cognitive outcome of rapid eye movement sleep behavior disorder

    An objective biomarker to predict the outcome of isolated rapid eye movement sleep behavior disorder (iRBD) is crucial for the management. This study aimed to investigate cognitive signature of brain [18F]FDG PET...

    Hyun Gee Ryoo, Jung-Ick Byun, Hongyoon Choi, Ki-Young Jung in Scientific Reports (2022)

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  3. No Access

    Article

    Second primary malignancy risk in thyroid cancer and matched patients with and without radioiodine therapy analysis from the observational health data sciences and informatics

    Risk of second primary malignancy (SPM) after radioiodine (RAI) therapy has been continuously debated. The aim of this study is to identify the risk of SPM in thyroid cancer (TC) patients with RAI compared wit...

    Seok Kim, Ji-In Bang, Dachung Boo… in European Journal of Nuclear Medicine and M… (2022)

  4. Article

    Open Access

    Quantitative salivary gland SPECT/CT using deep convolutional neural networks

    Quantitative single-photon emission computed tomography/computed tomography (SPECT/CT) using Tc-99m pertechnetate aids in evaluating salivary gland function. However, gland segmentation and quantitation of gla...

    Junyoung Park, Jae Sung Lee, Dongkyu Oh, Hyun Gee Ryoo, Jeong Hee Han… in Scientific Reports (2021)

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  5. Article

    Short Essay on 60 Years’ Challenges and Achievements of KSNM

    Hyun Gee Ryoo, Minseok Suh, ** Chul Paeng… in Nuclear Medicine and Molecular Imaging (2021)

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  6. No Access

    Article

    Deep learning-based interpretation of basal/acetazolamide brain perfusion SPECT leveraging unstructured reading reports

    Basal/acetazolamide brain perfusion single-photon emission computed tomography (SPECT) has been used to evaluate functional hemodynamics in patients with carotid artery stenosis. We aimed to develop a deep lea...

    Hyun Gee Ryoo, Hongyoon Choi, Dong Soo Lee in European Journal of Nuclear Medicine and M… (2020)

  7. No Access

    Article

    Spleen Scan for 68Ga-DOTATOC PET-Positive Pancreatic Tail Lesion: Differential Diagnosis of Neuroendocrine Tumor from Accessory Spleen

    68Ga-DOTATOC PET/CT is widely used as a functional imaging technique in the detection and characterization of neuroendocrine tumors (NETs). Pancreatic NET and intrapancreatic accessory spleen (IPAS) have similar....

    Hyun Gee Ryoo, Hongyoon Choi, Gi Jeong Cheon in Nuclear Medicine and Molecular Imaging (2020)

  8. No Access

    Article

    Basal and Acetazolamide Brain Perfusion SPECT in Internal Carotid Artery Stenosis

    Internal carotid artery (ICA) stenosis including Moyamoya disease needs revascularization when hemodynamic insufficiency is validated. Vascular reserve impairment was the key to find the indication for endarte...

    Teck Huat Wong, Qaid Ahmed Shagera, Hyun Gee Ryoo… in Nuclear Medicine and Molecular Imaging (2020)

  9. No Access

    Article

    Comparative Analysis of Lung Perfusion Scan and SPECT/CT for the Evaluation of Functional Lung Capacity

    This study aimed to compare lung perfusion scan with single photon emission computed tomography/computed tomography (SPECT/CT) for the evaluation of lung function and to elucidate the most appropriate modality...

    Hoon Young Suh, Sohyun Park, Hyun Gee Ryoo… in Nuclear Medicine and Molecular Imaging (2019)

  10. No Access

    Article

    Amyloid PET Quantification Via End-to-End Training of a Deep Learning

    Although quantification of amyloid positron emission tomography (PET) is important for evaluating patients with cognitive impairment, its routine clinical use is hampered by complicated preprocessing steps and...

    Ji-Young Kim, Hoon Young Suh, Hyun Gee Ryoo… in Nuclear Medicine and Molecular Imaging (2019)

  11. No Access

    Article

    Minimum Standardized Uptake Value from Quantitative Bone Single-Photon Emission Computed Tomography/Computed Tomography for Evaluation of Femoral Head Viability in Patients with Femoral Neck Fracture

    Bone single-photon emission computed tomography/computed tomography (SPECT/CT) has been widely used for evaluation of femoral head viability in patients with femoral neck fracture. The current study aimed to i...

    Hyun Gee Ryoo, Won Woo Lee, Ji Young Kim… in Nuclear Medicine and Molecular Imaging (2019)