Section 2821b - License for postprimary modalities(a) The Director shall recognize and follow the ARRT and NMTCB postprimary certification process in the following postprimary practice categories: mammography, computed tomography (CT), cardiac-interventional radiography, vascular-interventional radiography, and positron emission tomography (PET).(b) In order for a licensee who has obtained one of the three primary ARRT or NMTCB certifications set forth in section 2821a of this subchapter to practice in one of the postprimary modalities set forth in subsection (a) of this section, the licensee must first obtain postprimary certification from ARRT or NMTCB for that category, except: (1) a person with a primary license in radiation therapy may perform CT for treatment simulation; and(2) a person with a primary license in nuclear medicine technology may perform CT for attenuation correction on hybrid imaging equipment, such as PET/CT and SPECT/CT scanners.(c) In order to practice bone densitometry or apply ionizing radiation using bone densitometry equipment, a primary certification and license in radiography is required, with the exception that individuals who perform quantitative computed tomography (QCT) bone densitometry must obtain postprimary certification in CT in addition to primary certification.Added 2011, No. 116 (Adj. Sess.), § 48; amended 2017 , No. 48, § 20; 2019 , No. 30 , § 18.