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. 2021 Jun 11;17(2):e105–e123. doi: 10.4244/EIJ-D-21-00089

Figure 2.

Figure 2

Comparison of coronary calcium imaging by optical coherence tomography and high-definition intravascular ultrasound. A) Optical coherence tomography (OCT) shows superficial calcium extending to the medial layer (*). The calcium (*), where thickness can be measured due to the optical properties of light penetration through the calcium crystal. B) Co-registered image on high-definition intravascular ultrasound (HD-IVUS) does not allow measurement of calcium thickness. C) OCT shows superficial calcium extending to the medial layer (*), where thickness cannot be measured due to the limited penetration depth of light. D) Co-registered image on HD-IVUS does not allow measurement of calcium thickness.