HRCT TECHNIQUE

HRCT TECHNIQUE

Slice thickness 1 cm. [<0 .5="" and="" cm="" decreased="" improvement="" in="" no="" resolution="" snr="" spatial="">1.5-2 cm subtle differences cannot be detected].

Matrix 512x512.

Interspace gap 10 mm

WL: -500 to -800 Hu

WW: 1100-2000 Hu

mAs: 200-300

kVp: 120-140

Time: <1 div="" sec.="">

minIP: regional density differences can be made out better.

MIP: Nodules vs vessels [7 mm thickness with 3 mm interslice gap]

LOW DOSE HRCT: mAs: 40-80. Often affected by streak artefacts near vertebral bodies.