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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 131 - 137 (7page)
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Purpose: This study was designed to investigate the effects of voxel size, the oversampling technique, and the direction and area of measurement on modulation transfer function (MTF) values to identify the optimal method of MTF measurement. Materials and Methods: Images of the wire inserts of the SedentexCT IQ phantom were acquired, and MTF values were calculated under different conditions(voxel size of 0.1, 0.2, and 0.3 mm; 5 oversampling techniques; simulated pixel location errors; and different directions and areas of measurement). The differences in the MTF values across various conditions were evaluated. Results: The MTF 10 values showed smaller standard deviations than the MTF 50 values. Stable and accurate MTF values were obtained in the 0.1-mm voxel images. In the 0.3-mm voxel images, oversampling techniques of 11 lines or more did not show significant differences in MTF values depending on the presence of simulated location errors. MTF 10 values showed significant differences according to the direction and area of the measurement. Conclusion: To measure more accurate and stable MTF values, it is better to measure MTF 10 values in small-voxel images. In large-voxel images, the proper oversampling technique is required. MTF values from the radial and tangential directions may be different, and MTF values vary depending on the measured area.
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참고문헌 (21)
참고문헌 신청
2012 / SEDENTEXCT Guideline Development Panel. Radiation protection No 172. Cone beam CT for dental and maxillofacial radiology. Evidence based guidelines / European Commission Directorate-General for Energy
International Commission on Radiological Protection / 2004 / Managing patient dose in digital radiology. A report of the International Commission on Radiological Protection / Ann ICRP 34:1~73
Choi JW / 2015 / Relationship between physical factors and subjective image quality of cone-beam computed tomography images according to diagnostic task / Oral Surg Oral Med Oral Pathol Oral Radiol 119:357~365
Pauwels R / 2012 / Comparison of spatial and contrast resolution for cone-beam computed tomography scanners / Oral Surg Oral Med Oral Pathol Oral Radiol 114:127~135
Nakahara S / 2016 / One-year analysis of Elekta CBCT image quality using NPS and MTF / J Appl Clin Med Phys 17:211~222
International Commission on Radiological Protection / 2004 / Managing patient dose in digital radiology. A report of the International Commission on Radiological Protection / Ann ICRP 34:1~73
Choi JW / 2015 / Relationship between physical factors and subjective image quality of cone-beam computed tomography images according to diagnostic task / Oral Surg Oral Med Oral Pathol Oral Radiol 119:357~365
Pauwels R / 2012 / Comparison of spatial and contrast resolution for cone-beam computed tomography scanners / Oral Surg Oral Med Oral Pathol Oral Radiol 114:127~135
Nakahara S / 2016 / One-year analysis of Elekta CBCT image quality using NPS and MTF / J Appl Clin Med Phys 17:211~222
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