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The recent development of $\theta\mhyphen\theta$ techniques in pulsarscintillometry has opened the door for new high resolution imaging techniquesof the scattering medium. By solving the phase retrieval problem and recoveringthe wavefield from a pulsar dynamic spectrum, the Doppler shift, time delay,and phase offset of individual images can be determined. However, the resultsof phase retrieval from a single dish are only known up to a constant phaserotation, which introduces extra parameters when doing astrometry using VeryLong Baseline Interferometry. We present an extension to previous$\theta\mhyphen\theta$ methods using the interferometric visibilities betweenmultiple stations to calibrate the wavefields. When applied to existing datafor PSR B0834+06 we measure the effective screen distance and lens orientationwith five times greater precision than previous works.

High Resolution VLBI Astrometry of pulsar scintillation screens with the $\theta-\theta$ Transform