Final answer:
Ultrasounds and MRIs are the imaging procedures among the given options that do not require the use of ionizing radiation to produce images. CT scans do use ionizing radiation, so the correct answer is D. 1 and 3 only.
Step-by-step explanation:
The question asks which of the following imaging procedures do not require the use of ionizing radiation to produce an image: Ultrasound, Computer axial tomography (CAT or CT scan), and MRI (Magnetic Resonance Imaging). To answer this, we need to know the characteristics of these imaging technologies:
- Ultrasound uses sound waves to produce images and does not use any form of ionizing radiation.
- CT scans involve the use of X-rays, which are a form of ionizing radiation.
- MRI uses a magnetic field and radio waves to produce images and does not use ionizing radiation.
Based on the above information, the imaging procedures that do not require the use of ionizing radiation are Ultrasound and MRI. Therefore, the correct answer to the question is D. 1 and 3 only.