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AJNR - American Journal of Neuroradiology

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CT of the Head by Use of Reduced Current and Kilovoltage: Relationship between Image Quality and Dose Reduction

Mathias Cohnen^,a, Hubert Fischer^a, Jürgen Hamacher^a, Evaldo Lins^a, Rolf Kötter^a and Ulrich Mödder^a

^a From the Institute of Diagnostic Radiology (M.C., H.F., U.M.), the Department of Neurosurgery (J.H., E.L.), and Center for Anatomy and Brain Research (R.K.), Heinrich-Heine University, Düsseldorf.

View larger version (17K): [in a new window]   FIG 1. Subjective quality assessment (grade 1–6) plotted against surface dose (mGy) used in conventional scanning with the Toshiba Xpress SX, showing an inverse linear relationship. Dotted lines represent the standard error of the mean in scans with 135 kVp, full lines in scans with 120 kVp

View larger version (14K): [in a new window]   FIG 2. Subjective quality assessment (grade 1–6) plotted against surface dose (mGy) used in conventional scanning with the Siemens Somatom AR.SP, showing an inverse linear relationship. Dotted lines represent the standard error of the mean in scans with 130 kVp, full lines in scans with 110 kVp

View larger version (14K): [in a new window]   FIG 3. Subjective quality assessment (grade 1–7) plotted against surface dose (mGy) used in helical scanning with the Toshiba Xpress SX. Dotted lines represent standard error of the mean of scans with 120 kVp, full lines of scans with 100 kVp. The 80 kVp scan was unanimously rated as a 7

View larger version (17K): [in a new window]   FIG 4. Subjective quality assessment (grade 1–7) plotted against surface dose (mGy) used in helical scanning with the Siemens Somatom AR.SP. Dotted lines represent the standard error of the mean of scans with 130 kVp, full lines of scans with 110 kVp