1. Korean Institute for Accreditation of Medical Imaging. A study for the management of special and high-price medical devices. Seoul: Korean Institute for Accreditation of Medical Imaging;2010.
2. Lee S, Choi JI, Park MY, Yeo DM, Byun JY, Jung SE, Rha SE, Oh SN, Lee YJ. Intra- and interobserver reliability of gray scale/dynamic range evaluation of ultrasonography using a standardized phantom. Ultrasonography. 2014; 33:91–97.
Article
3. Choi JI, Kim PN, Jeong WK, Kim HC, Yang DM, Cha SH, Chung JJ. Establishing cutoff values for a quality assurance test using an ultrasound phantom in screening ultrasound examinations for hepatocellular carcinoma: an initial report of a nationwide survey in Korea. J Ultrasound Med. 2011; 30:1221–1229.
Article
4. Choi JI, Jung SE, Kim PN, Cha SH, Jun JK, Lee HY, Park EC. Quality assurance in ultrasound screening for hepatocellular carcinoma using a standardized phantom and standard clinical images: a 3-year national investigation in Korea. J Ultrasound Med. 2014; 33:985–995.
Article
5. Brenner DJ, Hall EJ. Computed tomography: an increasing source of radiation exposure. N Engl J Med. 2007; 357:2277–2284.
Article
9. Royal College of Radiologists. iRefer making the best use of clinical radiology [Internet]. London: Royal College of Radio-logists;2012. cited 2015 Sep 22. Available from:
http://www.irefer.org.uk/.
11. Oakeshott P, Kerry SM, Williams JE. Randomized controlled trial of the effect of the Royal College of Radiologists' guide-lines on general practitioners' referrals for radiographic exam-ination. Br J Gen Pract. 1994; 44:197–200.
12. Eccles M, Steen N, Grimshaw J, Thomas L, McNamee P, Soutter J, Wilsdon J, Matowe L, Needham G, Gilbert F, Bond S. Effect of audit and feedback, and reminder messages on primary-care radiology referrals: a randomised trial. Lancet. 2001; 357:1406–1409.
Article
13. Influence of Royal College of Radiologists' guidelines on referral from general practice: Royal College of Radiologists Working Party. BMJ. 1993; 306:110–111.