The board shall adopt rules necessary to administer section 151.1, to protect the health, safety, and welfare of the public, including rules governing the practice of chiropractic and defining any terms, whether or not specified in section 151.1, subsection 3. Such rules shall not be inconsistent with the practice of chiropractic and shall not expand the scope of practice of chiropractic or authorize the use of procedures not authorized by this chapter. These rules shall conform with chapter 17A.