Whole-lung dynamic respiratory CT: Novel respiratory function examination by dynamic wide volume scanning using 320-row ADCT
[Objective] Respiratory dynamic CT is used in cases of lung cancer, COPD and other respiratory diseases. However, the scan range of 16 cm is too narrow. Thus, we devised a procedure to extend the scan range.
[Methods] 1. Constant respiration cycle by sound guidance. 2. Two or more volumes of respiratory dynamic CT, with 1- to 2-cm overlap. 3. Body-surface marker on a precordia body surface. 4. Choice of an inspiratory peak phase and an expiratory peak phase of manually scanned dynamic data. 5. After coinciding the phase of two or more volumes, we connected them together and deleted the overlapped cross section for each phase data set.
[Results] We were able to create whole-lung dynamic respiratory data which combined two or more volumes. The upper and lower portion of the connected cross section moved synchronously.
[Conclusion] We can perform dynamic volume measurement of the whole lung, right lung, left lung, each lobe, and each segment, and acquire respiratory kinetics that were not obtained by the respiratory-function test thus far.