Measurement of AP and TS diameter of the chest wall on the reformatted axial image

<p><b>Copyright information:</b></p><p>Taken from "Dynamic magnetic resonance imaging in assessing lung function in adolescent idiopathic scoliosis: a pilot study of comparison before and after posterior spinal fusion"</p><p>http://www.josr-online.com/content/2/1/20</p><p>Journal of Orthopaedic Surgery and Research 2007;2():20-20.</p><p>Published online 19 Nov 2007</p><p>PMCID:PMC2203977.</p><p></p> (a) Upper level at the carina (C), maximal inspiratory image. (b) Lower level at the apical vertebra (A), maximal inspiratory image. Tangential lines are drawn to the anterior, posterior and lateral lung surfaces. The chest wall dimensions are then measured as the largest anteroposterior (AP, thick solid lines) and transverse (TS, dotted lines) dimensions on either side of the scoliosis separately. The chest wall motion is calculated as the difference between inspiration and expiration