Color doppler ultrasound detects movement. Thus, it can detect flow of blood in organs. The image at the right shows normal blood flow in a testis (blue and red areas). Unfortunately, this is not the ultrasound of your patient.
This color doppler ultrasound shows no blood flow to the testis (there are not red and blue areas). You probably should have taken the patient directly to the operating room. Spermatic cord torsion is the most common diagnosis when boys present with an acute scrotum. Unless the testis is untwisted promptly it may be lost to ischemia.