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Combining the endoscopic imaging with Optical Coherence Tomography Angiography (OCTA), information of blood vessels in superficial lumen tissues is expected to be acquired. However, in endoscopic OCT systems using proximal scanning probes, performance of OCTA encounters significant challenges due to non\u2010uniform rotational distortion (NURD) caused by the non\u2010constant rotation of the distal imaging unit. In this study, we proposed a registration method for endoscopic OCTA imaging in a proximally controlled OCT System. Global registration and A\u2010line registration were employed to correct the distortion caused by mechanical friction between the catheter sheath and torque coil. Experimental performances in both microfluidic channel and rat rectum show significant correction of NURD. 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