1naresh

Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

)
1nareshArray
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

)

Table 2: Mean and SD of SNR in various CT protocols with either IR or FBP^a
Tube Current 320 mAs Tube Current 275 mAs Tube Current 225 mAs
IR FBP IR FBP IR FBP
Non-Enhanced 
    WM 8.8 ± 2.1 7.9 ± 1, P = 0.01 8.0 ± 1.7 7.0 ± 1.3, P < .0001 7.6 ± 1.5 6.7 ± 1.4, P = .006
    GM 10.9 ± 2 9.4 ± 1.4, P < .0001 9.8 ± 1.4 8.3 ± 1.3, P < .0001 9.7 ± 1.8 8.4 ± 1.6, P < .0001
    LQ 1.4 ± 0.5 1.2 ± 0.4, P < .0001 1.3 ± 0.4 1.0 ± 0.3, P < .0001 1.2 ± 0.3 1.0 ± 0.3, P < .0006
    BG −448 −302, P < .0001 −385 −210, P < .0001 −295 −244, P < .0001
Contrast-Enhanced 
    WM 8.9 ± 1.8 7.6 ± 1.4, P < .0001 7.9 ± 1.5 6.8 ± 1.1, P < .0001 7.8 ± 1.4 6.5 ± 1.0, P < .0001
    GM 11.2 ± 1.7 10.2 ± 1.6, P = .001 10.2 ± 1.7 9.0 ± 1.4, P = .0008 9.4 ± 2.1 8.6 ± 1.7, P = .02
    LQ 1.3 ± 0.6 1.0 ± 0.4, P < .0001 1.2 ± 0.5 1.0 ± 0.4, P = 0.004 1.1 ± 0.3 0.9 ± 0.4, P < .001
    BG −385 −328, P < .0001 −222 −192, P < .008 −221 −191, P < .0001

Note: —LQ indicates liquor; BG, background.

↵a Data are shown for WM, GM, LQ, and BG measurements in air outside the skull. P values refer to differences between IR and FBP.