Which of the following statements is not true about the lateral L5-S1 projection?
a. If the waist is not supported, the CR must be angled 5-8 degrees caudad.
b. A lead mat should be placed on the tabletop behind the patient, and there should be close collimation to improve image quality.
c. A 14 x 17-inch (35- x 43-cm) IR should be used.
d. The CR is centered 1.5 inches (3-4 cm) inferior to the iliac crest and 2 inches (5 cm) posterior to the ASIS."