Final answer:
The preferred imaging procedure for evaluating proximal obstructions of the hepatic duct bifurcation is Magnetic Resonance Imaging (MRI), specifically with the use of MRCP.
Step-by-step explanation:
The preferred imaging procedure for evaluating proximal obstructions involving the hepatic duct bifurcation is Magnetic Resonance Imaging (MRI), specifically magnetic resonance cholangiopancreatography (MRCP). This test uses the principles of MRI to produce detailed images of the bile ducts, which can help in identifying blockages near the hepatic duct bifurcation. Being a non-invasive technique with high detail and without the use of ionizing radiation, MRI is advantageous over other imaging modalities like Computed Tomography (CT), Ultrasound, and Positron Emission Tomography (PET) for this particular application.