The present invention provides an apparatus for guiding a medical instrument. The medical apparatus includes a bracket member having a cavity dimensioned and configured to receive at least a portion of a medical instrument. A carriage member is slidably connected to a base assembly adapted to move the carriage member into an imaging position. The carriage assembly is adapted to rotationally support the bracket member, as well as provide a vertically adjustable height of the bracket member. A quick release member is operatively associated with the bracket and carriage members for removably attaching and detaching the bracket member to and from the carriage member when the carriage member is in the imaging position without losing the position and orientation of the carriage member.