Mr. Ji-Young Jung Profile

Ji-Young Jung

at Yonsei Univ

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Proceedings Article | 18 March 2008 Paper

Dosimetric measurements and comparison studies in digital imaging system

Ji-Young Jung, Hee-Joung Kim, Chang-Lae Lee, Hyo-Min Cho, Sora Nam

Proceedings Volume 6913, 69133K (2008) https://doi.org/10.1117/12.773141

KEYWORDS: X-rays, Chest, Abdomen, Diagnostics, Digital imaging, Imaging systems, Radiology, Aluminum, Calibration, Imaging technologies

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Number of radiologic exams using digital imaging systems has rapidly increased with advanced imaging technologies. However, it has not been paid attention to the radiation dose in clinical situations. It was the motivation to study radiation dosimetry in the DR system. The objective of this study was to measure beam quality and patient's dose using DR system and to compare them to both IEC standard and IAEA guidelines. The measured average dose for chest and abdomen was 1.376 mGy and 9.501 mGy, respectively, compared to 0.4 mGy and 10.0 mGy in IAEA guidelines. The results also indicated that the DR system has a lower radiation beam quality than that of the IEC standard. The results showed that the patients may be exposed higher radiation for chest exams and lower radiation for abdomen exams using DR system. IAEA Guidelines were prepared based on western people which may be different weight and height for patients compared them to Korean. In conclusion, a new guideline for acceptable DR dosimetry for Korean patients may need to be developed with further studies for large populations. We believe that this research greatly help to introduce the importance of the dosimetry in diagnostic radiology in Korea. And, a development of database for dosimetry in diagnostic radiology will become an opportunity of making aware of radiation safety of medical examination to patient.

Proceedings Article | 18 March 2008 Paper

Radiation dose measurement for various parameters in MDCT

Chang-Lae Lee, Hee-Joung Kim, Seong Su Jeon, Hyo-Min Cho, So Ra Nam, Ji-Young Jung

Proceedings Volume 6913, 69133J (2008) https://doi.org/10.1117/12.773173

KEYWORDS: Head, Calibration, Collimation, Computed tomography, Ionization, Scanners, Radiation effects, Ions, Abdomen, Digital Light Processing

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The MDCT parameters affecting radiation dose include tube voltage, tube current, change of beam collimation, and size of the human body. The purpose of this study was to measure and evaluate radiation dose for MDCT parameters. A comparative analysis of the radiation dose according to before and after the calibration of the ionization chamber was performed. The ionization chamber was used for measuring radiation dose in the MDCT, as well as of CTDI_W according to temperature and pressure correction factors in the CT room. As a result, the patient dose of CTDI_W values linearly increased as tube voltage and current were increased, and nonlinearly decreased as beam collimation was increased. And the CTDI_W value which was reflected calibration factors, as well as correction factors of temperature and pressure, was found to be greater by the range of 0.479 ~ 3.162 mGy in effective radiation dose than the uncorrected value. Also, Under the abdomen routine CT conditions used in hospitals, patient exposure dose showed a difference of a maximum of 0.7 mSv between before and after the application of such factors. These results imply that the calibration of the ion chamber, and the application of temperature and pressure of the CT room are crucial in measuring and calculating patient exposure dose.

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