Quality assurance phantoms and training phantoms for use with ultrasound, CAT scan, MRI and other medical imaging diagnostic apparatuses; quality assurance phantoms and training phantoms for use in stereotactic body radiation therapy, stereotactic radiosurgery, radiology, radiation therapy and other medical imaging; dosimetric phantoms for use in medical treatment planning, namely, for use in calculation and monitoring patient dosage for radiation therapy and medical imaging physics; medical devices used to calibrate ultrasound, CAT scan, MRI and other medical imaging diagnostic apparatuses for medical purposes