Usage of auto mA: deviation index adjustment on computed radiography of chest
Corresponding Author(s) : I Putu Eka Juliantara
International Journal of Allied Medical Sciences and Clinical Research,
Vol. 8 No. 2 (2020): 2020 Volume 8- Issue -2
Abstract
Background
In the digital imaging system, exposure index provides radiographers with useful feedback about the exposure received by the image receptor. An under-exposure or over-exposure image will produce the wrong exposure index, while the correct exposure will provide an appropriate exposure index. The high demand for radiographs of the thorax in Premier bintaro Hospital makes the concern more especially for adjusting the exposure index that must be carried out to be able to stay within recommended range so as to reduce detector exposure received that indirectly have an impact on decreasing patient dose.
Methods
This paper was made to determine the deviation index (DI) values of exposure produced on thorax radiography by applying automatic current (mA) in Premier Bintaro Hospital. This paper is prepared with literature review, observation, and documentation.
Results
From observations on 10 patients with Thorax PA examination using AEC was proven to be able to produce an exposure index with DI still in the range of ± 3. The variation in DI values shown values far from the red label (out of range). This is a good indication in terms of exposure received, especially avoiding over exposure that will increase the dose received by the patient.Using a range of kVp of 80-100 kVp is very appropriate to do more combined with the use of current automatic mA. A high kVp value is used to ensure the high energy photons can be detected by the receptor / plate so that the determination of AEC will be more accurate in accordance with the EI target to be achieved.
Conclusion
Application of automatic current (mA) can assist in adjusting the value of DI values which are assessed on the magnitude of the exposure index produced compared to the target exposure index that has been determined as the standard.
Keywords
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M. L. Butler, L. Rainford, J. Last, and P. C. Brennan, “Are exposure index values consistent in clinical practice? A multi-manufacturer investigation,” Radiat. Prot. Dosimetry, 139, 2010, 1–3, 371–374,.
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Available: www.carestream.com.
[4]. U. Mothiram, P. C. Brennan, S. J. Lewis, B. Moran, and J. Robinson, “Digital radiography exposure indices: A review,” J. Med. Radiat. Sci., 61(2), 2014, 112–118.
[5]. S. Don, “New Digital Radiography Exposure Indicators and the ACR Dose Index Registry for Digital Radiography,” 2015.
[6]. C. Reis et al., “Image quality and dose analysis for a PA chest X-ray: Comparison between AEC mode acquisition and manual mode using the 10kVp „rule,?” Radiography, 20(4), 2014, 339–345.
[7]. J. A. Seibert and R. L. Morin, “The standardized exposure index for digital radiography: An opportunity for optimization of radiation dose to the pediatric population,” Pediatr. Radiol., 41(5), 2011, 573–581.
[8]. S. J. Shepard et al., “Recommended Exposure Indicator for Digital Radiography ,” Rep. AAPM Task Gr. 116, 2009, 1–46.
[9]. M. D. Cohen, M. L. Cooper, K. Piersall, and B. K. Apgar, “Quality assurance: Using the exposure index and the deviation index to monitor radiation exposure for portable chest radiographs in neonates,” Pediatr. Radiol., 41(5), 2011, 592–601.
[10]. A. W. Scott, Y. Zhou, J. Allahverdian, J. L. Nute, and C. Lee, “Evaluation of digital radiography practice using exposure index tracking,” J. Appl. Clin. Med. Phys., 17(6), 2016, 349–355.
References
[2]. Carestream, “The concept of exposure index for carestream directview systems,” Jacqueline Gall., 2010, 1–2.
[3]. P. Martin, “Understanding Radiology Exposure Indicators,” Carestream, [Online] 2016.
Available: www.carestream.com.
[4]. U. Mothiram, P. C. Brennan, S. J. Lewis, B. Moran, and J. Robinson, “Digital radiography exposure indices: A review,” J. Med. Radiat. Sci., 61(2), 2014, 112–118.
[5]. S. Don, “New Digital Radiography Exposure Indicators and the ACR Dose Index Registry for Digital Radiography,” 2015.
[6]. C. Reis et al., “Image quality and dose analysis for a PA chest X-ray: Comparison between AEC mode acquisition and manual mode using the 10kVp „rule,?” Radiography, 20(4), 2014, 339–345.
[7]. J. A. Seibert and R. L. Morin, “The standardized exposure index for digital radiography: An opportunity for optimization of radiation dose to the pediatric population,” Pediatr. Radiol., 41(5), 2011, 573–581.
[8]. S. J. Shepard et al., “Recommended Exposure Indicator for Digital Radiography ,” Rep. AAPM Task Gr. 116, 2009, 1–46.
[9]. M. D. Cohen, M. L. Cooper, K. Piersall, and B. K. Apgar, “Quality assurance: Using the exposure index and the deviation index to monitor radiation exposure for portable chest radiographs in neonates,” Pediatr. Radiol., 41(5), 2011, 592–601.
[10]. A. W. Scott, Y. Zhou, J. Allahverdian, J. L. Nute, and C. Lee, “Evaluation of digital radiography practice using exposure index tracking,” J. Appl. Clin. Med. Phys., 17(6), 2016, 349–355.