Radiology Practice Test

Which of the following imaging modalities is non-invasive?

1. X-ray

2. CT Scan

3. Ultrasound

4. Fluoroscopy

The correct answer is: Ultrasound

Ultrasound is categorized as a non-invasive imaging modality because it utilizes sound waves to create images of the internal structures of the body without the need for incisions or other invasive procedures. This technique is particularly advantageous in medical diagnostics as it does not involve ionizing radiation, making it safer for patients. In addition to being non-invasive, ultrasound imaging is widely used for assessing a variety of conditions, particularly in obstetrics for monitoring pregnancies and examining fetal development. Its ability to provide real-time imaging and dynamic assessments adds to its utility in clinical scenarios. Other imaging modalities, although effective for their purposes, have invasive characteristics or involve ionizing radiation, which can pose risks to patients. Hence, ultrasound stands out as a safe and effective non-invasive option in the realm of medical imaging.