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. 2021 Feb 19;41(2):509–523. doi: 10.1148/rg.2021200049

Figure 3c.

Constrained spectral field of view (FOV). Axial abdominopelvic CT images obtained in a 233-lb (106-kg) patient with a second-generation dual-source DECT scanner. (a, b) Image acquired at 100 kVp (a) has a larger FOV (50 cm) than an image acquired at 140 kVp Sn (33 cm) (b) owing to a difference in associated detector size. (c) Single-energy–equivalent image shows that the high-kVp tube-detector constrains the spectral FOV, which is limited to the area within the dotted circle, and also degrades the image quality of structures that lie outside the spectral FOV (arrows). (d) On a color overlay MD-iodine image, the constrained spectral FOV limits the anatomic area (within the dotted circle) for which qualitative and quantitative material-specific information (eg, iodine distribution) can be obtained. (e) On a virtual noncontrast (VNC) image, the areas outside the spectral FOV (dotted circle) show spurious high attenuation (arrows).

Constrained spectral field of view (FOV). Axial abdominopelvic CT images obtained in a 233-lb (106-kg) patient with a second-generation dual-source DECT scanner. (a, b) Image acquired at 100 kVp (a) has a larger FOV (50 cm) than an image acquired at 140 kVp Sn (33 cm) (b) owing to a difference in associated detector size. (c) Single-energy–equivalent image shows that the high-kVp tube-detector constrains the spectral FOV, which is limited to the area within the dotted circle, and also degrades the image quality of structures that lie outside the spectral FOV (arrows). (d) On a color overlay MD-iodine image, the constrained spectral FOV limits the anatomic area (within the dotted circle) for which qualitative and quantitative material-specific information (eg, iodine distribution) can be obtained. (e) On a virtual noncontrast (VNC) image, the areas outside the spectral FOV (dotted circle) show spurious high attenuation (arrows).