Improved Imaging of the Cervico-Thoracic Junction in Computed Tomography
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Purpose: To reduce beam hardening artifacts caused by the shoulder joint, we explored new and unique methods to improve the quality of images, such as varying the injection site and changing the position of patients (swimmers position). Materials and Methods: Fifth-four patients underwent neck CT examinations performed in routine and swimmers position and with a 64-slice MDCT scanner in spiral scanning. To examine the difference due to the injection sites of contrast material, subjects were divided into right- and left-side groups. For the evaluation of images, we carried out a subjective and objective assessment based on radiologists’ ratings and noise measurement. Results: Images of the lower neck in the swimmers position exhibited less hardening and streak artifacts. The subjective and objective evaluations showed that the swimmers position received higher rating by radiologists and had lower noise level than that of routine position. The swimmers position was the most effective for the diagnosis of the cervico-thoracic junction area. As for the injection site, we obtained better images by an injection of contrast material in the right arm than in the left. Conclusion: CT examination of the lower neck in the swimmers position may improve the quality of image and the effectiveness of diagnosis. The injection of a contrast material to the right side rather than the left side reduced foreign body artifacts.
Abstract
Purpose: To reduce beam hardening artifacts caused by the shoulder joint, we explored new and unique methods to improve the quality of images, such as varying the injection site and changing the position of patients (swimmers position). Materials and Methods: Fifth-four patients underwent neck CT examinations performed in routine and swimmers position and with a 64-slice MDCT scanner in spiral scanning. To examine the difference due to the injection sites of contrast material, subjects were divided into right- and left-side groups. For the evaluation of images, we carried out a subjective and objective assessment based on radiologists’ ratings and noise measurement. Results: Images of the lower neck in the swimmers position exhibited less hardening and streak artifacts. The subjective and objective evaluations showed that the swimmers position received higher rating by radiologists and had lower noise level than that of routine position. The swimmers position was the most effective for the diagnosis of the cervico-thoracic junction area. As for the injection site, we obtained better images by an injection of contrast material in the right arm than in the left. Conclusion: CT examination of the lower neck in the swimmers position may improve the quality of image and the effectiveness of diagnosis. The injection of a contrast material to the right side rather than the left side reduced foreign body artifacts.
참고문헌 (21)
- Rothenberg LN, "CT dose assessment" (1994), American Association of Physicists in Medicine Specifications and acceptance testing in quality control of diagnostic x-ray equipment
- Hounsfield GN, "Computerized transverse axial scanning (tomography). I. Description of system", Br J Radiol, 46, pp.1016~1022 (1973)
- Fullerton GD, "Medical physics of CT and Ultrasound: Tissue imaging and Characterization, Medical physics monograph No. 6", American Institute of physics, pp.717~ (1980)
- Siewerdsen JH, "Cone-beam computed tomography with a flat-panel imager: magnitude and effects of x-ray scatter", Med Phys, 28, pp.220~231 (2001)
- Jarry G, "Characterization of scattered radiation in kV CBCT images using Monte Carlo simulations", Med Phys, 33, pp.4320~4329 (2006)
- Glover GH, "Compton scatters effects in CT reconstruction", Med Phys, 9, pp.860~867 (1982)
- Brooks RA, "Beam hardening in x-ray reconstructive tomography", Phys Med Biol, 21, pp.390~398 (1976)
- McDavid WD, "Correction for spectral artifacts in cross-sectional reconstruction from x-rays", Med Phys, 4, pp.54~57 (1977)
- Link TM, "CT of metal implants: reduction of artifacts using an extended CT scale technique", J Comput Assist Tomogr, 24, pp.165~172 (2000)
- Hinderling T, "Computed tomography reconstruction from hollow projections: an application to in vivo evaluation of artificial hip joints", J Comput Assist Tomogr, 3, pp.52~57 (1979)
- Kalender WA, "Reduction of CT artifacts caused by metallic implants", Radiology, 164, pp.576~577 (1987)
- Nassi M, "Iterative reconstruction-reprojection: an algorithm for limited data cardiac-computed tomography", IEEE Trans Biomed Eng, 29, pp.333~341 (1982)
- Wang G, "Local computed tomography via iterative deblurring", Scanning, 18, pp.582~588 (1996)
- Mott DJ, "The removal of a “cupping” artefact from brain images produced by the EMI 7070 CT scanner", Br J Radiol, 58, pp.873~880 (1985)
- Soltanian-Zadeh H, "CT artifact correction: An image processing approach", SPIE, 2710, pp.477~485 (1996)
- Kane AG, "Swimmer’s CT: improved imaging of the lower neck and thoracic inlet", Am J Neuroradiol, 25, pp.859~862 (2004)
- Gisbert VL, "Incidence and diagnosis of C7-T1 fractures and subluxations in multiple-trauma patients: evaluation of the advanced trauma life support guidelines", Surgery, 106, pp.702~709 (1989)
- American College of Surgeons Committee on Trauma, "Advanced trauma life support program for physicians" (1984), American College of Surgeons
- Tehranzadeh J, "Efficacy of limited CT for nonvisualized lower cervical spine in patients with blunt trauma", Skeletal Radiol, 23, pp.349~352 (1994)
- Wegener OH, "Whole Body Computed Tomography, 2nd ed" (1993), Blackwell Scientific Publications
- Lin JT, "Evaluation of occult cervical spine fractures on radiographs and CT", Emerg Radiol, 10, pp.128~134 (2003)