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  1. Article ; Online: Managing Radiation Dose from Chest CT in Patients with COVID-19.

    Lee, Choonsik

    Radiology

    2020  Volume 298, Issue 3, Page(s) E158–E159

    MeSH term(s) COVID-19 ; Humans ; Radiation Dosage ; SARS-CoV-2 ; Thorax ; Tomography, X-Ray Computed
    Keywords covid19
    Language English
    Publishing date 2020-11-10
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 80324-8
    ISSN 1527-1315 ; 0033-8419
    ISSN (online) 1527-1315
    ISSN 0033-8419
    DOI 10.1148/radiol.2020204129
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  2. Article ; Online: How to estimate effective dose for CT patients.

    Lee, Choonsik

    European radiology

    2020  Volume 30, Issue 4, Page(s) 1825–1827

    Abstract: Key points: • Rehani et al provide important insight into the status quo of CT dose and call an urgent attention to the high-dose group receiving over 100 mSv. • It is crucial to clearly understand the calculation algorithm of effective dose behind the ... ...

    Abstract Key points: • Rehani et al provide important insight into the status quo of CT dose and call an urgent attention to the high-dose group receiving over 100 mSv. • It is crucial to clearly understand the calculation algorithm of effective dose behind the CT dose reporting systems and potential uncertainties.
    MeSH term(s) Algorithms ; Humans ; Radiation Dosage ; Tomography, X-Ray Computed
    Language English
    Publishing date 2020-02-04
    Publishing country Germany
    Document type Editorial ; Comment
    ZDB-ID 1085366-2
    ISSN 1432-1084 ; 0938-7994 ; 1613-3749
    ISSN (online) 1432-1084
    ISSN 0938-7994 ; 1613-3749
    DOI 10.1007/s00330-019-06625-7
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  3. Article ; Online: Absorbed dose coefficients for pediatric differentiated thyroid cancer patients undergoing radioiodine therapy.

    Kwon, Tae-Eun / Kitahara, Cari M / Lee, Choonsik

    Journal of radiological protection : official journal of the Society for Radiological Protection

    2024  Volume 44, Issue 1

    Abstract: The escalating incidence of differentiated thyroid cancer (DTC) in pediatric patients and the resultant growing use of radioactive iodine (RAI) reinforce the need to evaluate radiation exposure to normal tissues and radiation-induced health risks in ... ...

    Abstract The escalating incidence of differentiated thyroid cancer (DTC) in pediatric patients and the resultant growing use of radioactive iodine (RAI) reinforce the need to evaluate radiation exposure to normal tissues and radiation-induced health risks in pediatric patients undergoing RAI therapy. In the current study, we calculated absorbed dose coefficients (i.e. absorbed dose per unit activity administered, mGy MBq
    MeSH term(s) Adult ; Humans ; Child ; Thyroid Neoplasms ; Iodine Radioisotopes/therapeutic use ; Radiation Dosage ; Thyroidectomy ; Radiometry/methods
    Chemical Substances Iodine Radioisotopes
    Language English
    Publishing date 2024-02-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/1361-6498/ad1fdc
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    Zs.A 1886: Show issues Location:
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  5. Article ; Online: CT organ dose calculator size adaptive for pediatric and adult patients.

    Lee, Choonsik / Yeom, Yeon Soo / Folio, Les

    Biomedical physics & engineering express

    2022  Volume 8, Issue 6

    Abstract: ... ...

    Abstract Background
    MeSH term(s) Adult ; Humans ; Child ; Radiation Dosage ; Tomography, X-Ray Computed/methods ; Phantoms, Imaging ; Monte Carlo Method ; Radiometry
    Language English
    Publishing date 2022-10-19
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural
    ISSN 2057-1976
    ISSN (online) 2057-1976
    DOI 10.1088/2057-1976/ac9845
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  6. Article ; Online: Korean-specific iodine S values for use in internal dosimetry.

    Kwon, Tae-Eun / Chung, Yoonsun / Lee, Choonsik

    Nuclear engineering and technology

    2023  Volume 55, Issue 12, Page(s) 4659–4663

    Abstract: The use of iodine S values derived using the International Commission Radiological Protection (ICRP) phantoms may introduce significant bias in internal dosimetry for Koreans due to anatomical variability. In the current study, we produced an extensive ... ...

    Abstract The use of iodine S values derived using the International Commission Radiological Protection (ICRP) phantoms may introduce significant bias in internal dosimetry for Koreans due to anatomical variability. In the current study, we produced an extensive dataset of Korean S values for selected five iodine radioisotopes (I-125, I-129, I-131, I-133, and I-134) for use in radiation protection. To calculate S values, we implemented Monte Carlo simulations using the Mesh-type Reference Korean Phantoms (MRKPs), developed in a high-quality/fidelity mesh format. Noticeable differences were observed in S value comparisons between the Korean and ICRP reference phantoms with ratios (Korean/ICRP) widely ranging from 0.16 to 6.2. The majority of S value ratios were lower than the unity in Korean phantoms (interquartile range =0.47-1.28; mean = 0.96; median = 0.69). The S values provided in the current study will be extensively utilized in iodine internal dosimetry for Koreans.
    Language English
    Publishing date 2023-09-22
    Publishing country Korea (South)
    Document type Journal Article
    ISSN 2234-358X
    ISSN (online) 2234-358X
    DOI 10.1016/j.net.2023.09.005
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  7. Article ; Online: Absorbed dose coefficients for adult thyroid cancer patients undergoing radioiodine therapy.

    Kwon, Tae-Eun / Pasqual, Elisa / Kitahara, Cari M / Lee, Choonsik

    Journal of radiological protection : official journal of the Society for Radiological Protection

    2023  Volume 43, Issue 2

    Abstract: Use of radioactive iodine (RAI) for thyroid cancer patients is accompanied by elevated risks of radiation-induced adverse effects due to significant radiation exposure of normal tissues or organs other than the thyroid. The health risk estimation for ... ...

    Abstract Use of radioactive iodine (RAI) for thyroid cancer patients is accompanied by elevated risks of radiation-induced adverse effects due to significant radiation exposure of normal tissues or organs other than the thyroid. The health risk estimation for thyroid cancer patients should thus be preceded by estimating normal tissue doses. Although organ dose estimation for a large cohort often relies on absorbed dose coefficients (i.e. absorbed dose per unit activity administered, mGy MBq
    MeSH term(s) Humans ; Adult ; Thyroid Neoplasms/radiotherapy ; Iodine Radioisotopes/therapeutic use ; Thyrotropin Alfa/therapeutic use ; Thyrotropin/therapeutic use ; Iodine ; Retrospective Studies
    Chemical Substances Iodine Radioisotopes ; Thyrotropin Alfa ; Thyrotropin (9002-71-5) ; Iodine (9679TC07X4)
    Language English
    Publishing date 2023-05-25
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/1361-6498/acd648
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    Zs.A 1886: Show issues Location:
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  8. Article ; Online: NCIRF: an organ dose calculator for patients undergoing radiography and fluoroscopy.

    Lee, Choonsik / Yeom, Yeon Soo / Shin, Jungwook / Streitmatter, Seth W / Kitahara, Cari M

    Biomedical physics & engineering express

    2023  Volume 9, Issue 4

    Abstract: ... ...

    Abstract Background
    MeSH term(s) Adult ; Humans ; Male ; Child ; Female ; Radiation Dosage ; Radiography ; Radiometry/methods ; Fluoroscopy ; Computer Simulation
    Language English
    Publishing date 2023-05-23
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural
    ISSN 2057-1976
    ISSN (online) 2057-1976
    DOI 10.1088/2057-1976/acd2de
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  9. Article ; Online: Reconstruction of organ doses for patients undergoing computed tomography examinations in Canada 1992-2019.

    Lee, Choonsik / Moroz, Brian / Thome, Christopher / Gaudreau, Katherine / Emami, Pirouz / Little, Mark P

    Radiation protection dosimetry

    2024  Volume 200, Issue 4, Page(s) 379–386

    Abstract: We derived the first comprehensive organ dose library for Canadian pediatric and adult patients who underwent computed tomography (CT) scans between 1992 and 2019 to support epidemiological analysis of radiation risk. We calculated organ absorbed doses ... ...

    Abstract We derived the first comprehensive organ dose library for Canadian pediatric and adult patients who underwent computed tomography (CT) scans between 1992 and 2019 to support epidemiological analysis of radiation risk. We calculated organ absorbed doses for Canadian CT patients in two steps. First, we modeled Computed Tomography Dose Index (CTDI) values by patient age, scan body part, and scan year for the scan period between 1992 and 2019 using national survey data conducted in Canada and partially the United Kingdom survey data as surrogates. Second, we converted CTDI values to organ absorbed doses using a library of organ dose conversion coefficients built in an organ dose calculation program, the National Cancer Institute dosimetry system for CT. In result, we created a library of doses delivered to 33 organs and tissues by different patient ages and genders, scan body parts and scan years. In the scan period before 2000, the organs receiving the greatest dose in the head, chest and abdomen-pelvis scans were the active marrow (3.7-15.2 mGy), lungs (54.7-62.8 mGy) and colon (54.9-68.5 mGy), respectively. We observed organ doses reduced by 24% (pediatric head and torso scans, and adult head scans) and 55% (adult torso scans) after 2000. The organ dose library will be used to analyse the risk of radiation exposure from CT scans in the Canadian CT patient cohort.
    MeSH term(s) Adult ; Humans ; Child ; Male ; Female ; Radiation Dosage ; Monte Carlo Method ; Canada ; Tomography, X-Ray Computed/methods ; Radiometry/methods ; Phantoms, Imaging
    Language English
    Publishing date 2024-01-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncad315
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    Zs.A 2009: Show issues Location:
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  10. Article ; Online: Conversion factors to derive organ doses for canine subjects undergoing CT examinations.

    Yoon, James / Lee, Choonsik

    Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association

    2021  Volume 62, Issue 4, Page(s) 421–428

    Abstract: Although a large number of CT scans are being conducted on small animals, especially in Western countries, little is known of absorbed dose from veterinary CT scans. In the current retrospective analytical study, we estimated the radiation dose delivered ...

    Abstract Although a large number of CT scans are being conducted on small animals, especially in Western countries, little is known of absorbed dose from veterinary CT scans. In the current retrospective analytical study, we estimated the radiation dose delivered to dogs from CT scans with various scan protocols and compared the results with those of human patients. We adopted a total of three computerized canine models with three sizes combined with a computer simulation model of a CT scanner. The eyes of the dog model received the greatest dose, 1.10 mGy/mGy, in the head scan, followed by a brain dose of 0.85 mGy/mGy. In the chest, abdomen-pelvis (AP), chest-abdomen-pelvis, and head-chest-abdomen-pelvis scans, the heart wall (0.93 mGy/mGy), ovaries (0.99 mGy/mGy), lungs (1.12 mGy/mGy), and thyroid (1.23 mGy/mGy) received the greatest organ doses, respectively. The smallest dog model received up to 1.4-fold greater organ doses than the largest dog in both the chest and AP scans. Overall, the medium-size canine model received organ doses comparable to those of the 1-year-old child model in the head scan, the 5-year-old child in chest scan, and the 10-year-old child in AP scan. The organ dose conversion factors derived from this study should help evaluate absorbed dose for canine patients undergoing CT exams.
    MeSH term(s) Animals ; Computer Simulation ; Dogs ; Head/diagnostic imaging ; Humans ; Male ; Phantoms, Imaging ; Radiation Dosage ; Retrospective Studies ; Thorax/diagnostic imaging ; Tomography, X-Ray Computed/veterinary
    Language English
    Publishing date 2021-05-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 2142058-0
    ISSN 1740-8261 ; 1058-8183
    ISSN (online) 1740-8261
    ISSN 1058-8183
    DOI 10.1111/vru.12979
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