Purpose
Technological development trying to reduce dose by different strategies: high pitch studies and organ-based tube-current modulation.
Theydecrease radiation dose up to 40% in sensitive organs.
Our purpose is to compare global radiation dose and image quality in chest CT using a high pitch technique (Flash),
an organ-based tube current modulation (X-care) and conventional studies.
Methods and Materials
INTRODUCTION:
Radiation dose in CT generates increasing concern.
Breast is always included in thoracic CT studies,
but never it is the organ of interest.
Technological development seeks to reduce doses from different strategies:
Studies of high pitch: Flash (cardiac imaging)
Selective modulation system stube:X-care decrease radiation dose ≤40% sensitive organs (breast,
thyroid...)
*Flash:Fig. 1
Flash is a prospective acquisition using 2 tubes interleaved fashion working with the same KV.
Lets to use a high pitch,
but it has a limited FOV.
*X-care: Fig. 2 ,Fig....
Results
Total radiation dose medianswere obtained:Fig. 6
X-care: 2.08 mSv (1.82-3.5)
Flash: 2.43 mSv (1.79-4.45)
Conventional CT: 2.22 mSv (1.91-2.8)
BMI: 25 (22-30) was similar in three groups.
Image quality means were revealed: Fig. 7
X-care: 1.5
Flash: 1.8
Conventional CT: 2.2.
Conclusion
Global radiation dose was similar in the three techniques,
so that X-care should be the first technique of choicefor women becauseit reducesdose in sensitive organs.
Image quality of X-care was significantly better than conventional CT and it was similar to Flash.
References
Elias J.
Antypas et al.
A Comprehensive Approach to CT Radiation Dose Reduction: One Institution’s Experience.
AJR,
2011
Vollmar,
Kalender.
Reduction of dose to the female breast in thoracic CT: a comparison of standard-protocol,
bismuth- shielded,
partial and tube-current-modulated CT examinations.
Eur Radiol,
2008
Xinhui Duan et al.
Dose Reduction to Anterior Surfaces With Organ-Based Tube-Current Modulation: Evaluation of Performance in a Phantom Study .
AJR,
2011
