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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Med Phys. 2019 Apr 1;46(5):2330–2336. doi: 10.1002/mp.13502

Figure 3.

Figure 3.

Illustration of the difference in CT number mapping before and after density correction for one patient (patient no. 3 in Table 2). (a) Deep inspiration breath hold (DIBH) CT; (b) deformed end of exhalation (EE) CT before density correction; (c) deformed EE CT after density correction; (d) EE CT before deformation; (e) The difference inside the lung between (a) and (c); (f) The zoom-in of the rectangular regions in (a), (b), and (c). The CT numbers inside the lung on the deformed EE CT after density correction (c) are much closer to those of the DIBH CT (a) than are those of the deformed EE CT without density correction (b).