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AJNR - American Journal of Neuroradiology

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Comparison of Image Quality Between Conventional and Low-Dose Nonenhanced Head CT

Mark E. Mullins^a, Michael H. Lev^a, Peter Bove^e, Cara E. O’Reilly^a, Sanjay Saini^b, James T. Rhea^d, James H. Thrall^a, George J. Hunter^a, Leena M. Hamberg^a and R. Gilberto Gonzalez^a

^a Neuroradiology Division, Massachusetts General Hospital and the Harvard Medical School, Boston, MA
^b Abdominal Imaging Division, Massachusetts General Hospital and the Harvard Medical School, Boston, MA
^c Emergency Radiology Division, Massachusetts General Hospital and the Harvard Medical School, Boston, MA
^d Office of the Chairman, Massachusetts General Hospital and the Harvard Medical School, Boston, MA
^e Center for Diagnostic Imaging, Orlando, FL

View larger version (100K): [in a new window]   FIG 1. Images in a 70-year-old woman show normal brain. Standard- and low-dose nonenhanced head CT scans at identical levels are compared. A and B, Posterior fossa (medulla and cerebellar hemispheres) at 170 (A) and 90 (B) mAs. C and D, Thalamus (deep GM) and forceps major (WM) at 170 (C) and 90 (D) mAs. E and F, Centrum semiovale (WM) at 170 (A) and 90 (B) mAs.

View larger version (98K): [in a new window]   FIG 2. Images in a 70-year-old woman show normal brain. Geometric magnification of data was obtained by using a standard, nonenhanced head CT technique and a low-dose technique at an identical level. A, 170 mAs. B, 90 mAs.