1. A method for verifying a quality of registration of first and second images of an internal anatomic target obtained using a first imaging system and a second imaging system having a first coordinate system and a second coordinate system, respectively, the method comprising: (a) acquiring the first image of the anatomic target using the first imaging system and acquiring a location of at least a portion of a third imaging system in the first coordinate system; (b) measuring a distance between the third imaging system and the anatomic target using the third imaging system; (c) acquiring the second image of the anatomic target using the second imaging system; and (d) based on (i) a location of the anatomic target in the first image, (ii) the location of the at least a portion of the third imaging system in the first coordinate system, and (iii) the measured distance, computing an error in the registration.