Doctors Bartrum and Crow have updated their 1977 book, entitled “Grey Scale Ultrasound: A Manual for Physicians and Technical Personnel” to this current book, which stresses their conversion to real time ultrasound. Their writing style remains simple and lighthearted. Certainly the scan quality has dramatically improved over the first edition, although the machine used by them is no longer in commercial production. The scans are predominantly white on black, with a few reversals.