Computed Tomography (CT). Figure 2.15 The principle of applanation tonometry. The artery is partially compressed against a hard structure. The small (0.5mm in diameter) sensor detects the force of the artery wall. Accessed 2012 (▇▇▇▇▇.▇▇▇▇▇▇▇▇▇▇▇▇▇▇.▇▇▇). Aortic PWV is measured as: Aortic PWV = Distance m/s Transit time The Philips Precedence single-photon emission computed tomography (SPECT)/CT 16- Slice multi-detector (MDCT) system (Philips Healthcare, Best, Netherlands) was used for scans of the chest and abdomen (Figure 2.17). The scanner is capable of performing non- diagnostic, unenhanced CT for the purpose of quantifying VC. The precedence SPECT/CT performs Spiral/helical scanning which is characterised by a continuous gantry rotation and continuous data acquisition while the scan couch is moving at constant speed. In the present study a scan field of view (SFoV) of 50cm was required to include both the chest and abdomen incorporating the carotid to the femoral arteries. The camera has a rotation speed of 0.5s. The radiation dose for this scan was 5mSv; moderately lower than a diagnostic CT scan used in routine clinical practice with radiation doses ranging between 10 – 15mSv.
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