Browse > Article
http://dx.doi.org/10.7742/jksr.2019.13.5.757

The Necessity of Resetting the Filter Criteria for the Minimization of Dose Creep in Digital Imaging Systems  

Kim, Kyo Tae (Research Team of Radiological Physics & Engineering, Korea Institute of Radiological & Medical Sciences)
Kim, Kum Bae (Research Team of Radiological Physics & Engineering, Korea Institute of Radiological & Medical Sciences)
Kang, Sang Sik (Department of Radiological Science, International University of Korea)
Park, Ji Koon (Department of Radiological Science, International University of Korea)
Publication Information
Journal of the Korean Society of Radiology / v.13, no.5, 2019 , pp. 757-763 More about this Journal
Abstract
Recently, Following the recent development of flat panel detector with wide dynamic ranges, increasing numbers of healthcare providers have begun to use digital radiography. As a result, filter thickness standards should be reestablished, as current clinical practice requires the use of thicknesses recommended by the National Council on Radiation Protection and Measurements, which are based on information, acquired using conventional analog systems. Here we investigated the possibility of minimizing dose creep and optimizing patient dose using Al filters in digital radiography. The use of thicker Al filters resulted in a maximum 19.3% reduction in the entrance skin exposure dose when medical images with similar sharpness values were compared. However, resolution, which is a critical factor in imaging, had a significant change of 1.01 lp/mm. This change in resolution is thought to be due to the increased amount of scattered rays generated from the object due to the X-ray beam hardening effect. The increase in the number of scattered rays was verified using the scattering degradation factor. However, the FPD, which has recently been developed and is widely used in various areas, has greater response to radiation than analog devices and has a wide dynamic range. Therefore, the FPD is expected to maintain an appropriate level of resolution corresponding to the increase in the scattered-ray content ratio, which depends on filter thickness. Use of the FPD is also expected to minimize dose creep by reducing the exposure dose.
Keywords
filter; dose creep; flat panel detector; exposure dose; digital radiography;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 R. P. Rossi, B. Harnisch, and W. R. Hendee, "Reduction of radiation exposure in radiography of the chest," Radiology, Vol. 144, No. 4, pp. 909-914, 1982.   DOI
2 John G. Bailey, "Medical X-ray and Gamma ray protection for energies up to 10 MeV-Equipment design and use: NCRP Report No. 33," American journal of public health and the nation's health, Vol. 58, No. 11, pp. 2176-2177, 1968   DOI
3 S. J. Shepard and J. Wang, "An exposure indicator for digital radiography," American Association of Physicists in Medicine, College Park, 2009.
4 S. S. Kang, K. T. Kim, J. K. Park, "The Study on Interpretation of the Scatter Degradation Factor using an additional Filter in a Medical Imaging System," Journal of the Korean Society of Radiology, Vol. 13, No. 4, pp. 589-596, 2019.   DOI
5 R. Y. L. Chu and J. Fisher, "Standardized methods for measuring diagnostic x-ray exposures," American Institute of Physics, New York, 1990.
6 G. H. Lee, "Normal scan of the patient dose recommendation amount of radiology guidelines", Korea Food and Drug Administration, Cheongju, 2012.
7 S. T. Kim and B. H. Han, "Evaluation of the Patient Dose in Case of Standard Radiographic Examinations Using CR and DR," Journal of radiological science and technology. Vol. 33, No. 3, pp. 173-178, 2010.
8 European Commission, "EUR 16260 - European guidelines on quality criteria for diagnostic radiographic images," Office for Official Publications of the European Communities, Luxembourg, 1996.
9 N. B. Nill, "Conversion between sine wave and square wave spatial frequency response of an imaging system," MITRE Tech, Bedford, 2001.
10 G. Dougherty, "Digital image processing for medical applications," Cambridge University Press, New York, 2009.
11 H. Aichinger, J. Dierker, S. Joite-Barfuss, and M. Sabel, "Radiation Exposure and Image Quality in X-ray Diagnostic Radiology," Springer, Heidelberg, 2012.
12 I. H. Choi, K. T. Kim, Y. J. Heo, S. S. Kang, S. C. Noh, B. J. Jung, S. H. Nam, J. K. Park, "The Study of Forward Scattering Dose according to the Thickness of Filter in General Radiography," Journal of the Korean Society of Radiology, Vol. 9, No. 7, pp. 445-448, 2015.   DOI