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DOI: 10.1148/radiol.2371041227
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Chest CT Performed with Z-Axis Modulation: Scanning Protocol and Radiation Dose1

Mannudeep K. Kalra, MD, DNB, Stefania Rizzo, MD, Michael M. Maher, MD, FRCR, FFR (RCSI), Elkan F. Halpern, PhD, Thomas L. Toth, DSc, Jo-Anne O. Shepard, MD and Suzanne L. Aquino, MD

1 From the Division of Thoracic Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, White 270-E, 55 Fruit St, Boston, MA 02114 (M.K.K., S.R., M.M.M., E.F.H., J.O.S., S.L.A.); and GE Medical Systems, Waukesha, Wis (T.L.T.). Received August 11, 2004; revision requested October 14; revision received December 1; accepted January 14. Supported in part by a grant from GE Medical Systems, Waukesha, Wis. Address correspondence to M.K.K. (e-mail: mannudeep_k_kalra{at}yahoo.com).



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  		Figure a. Transverse CT images obtained in a 53-year-old woman with left pleural effusion who underwent CT scanning of the chest with (a) z-axis modulation and a noise index of 15.0 HU (46.7-mAs mean tube current–time product) and (b) the fixed tube current technique (144-mAs mean tube current–time product). Note that the qualitative noise was greater in images acquired with z-axis modulation than in images acquired with a fixed tube current.

 


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  		Figure b. Transverse CT images obtained in a 53-year-old woman with left pleural effusion who underwent CT scanning of the chest with (a) z-axis modulation and a noise index of 15.0 HU (46.7-mAs mean tube current–time product) and (b) the fixed tube current technique (144-mAs mean tube current–time product). Note that the qualitative noise was greater in images acquired with z-axis modulation than in images acquired with a fixed tube current.

 




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