text: A formalism used in this technique uses a pulse sequence and a gradient field to encode spatial information which is Fourier transformed from the k-space image.
full_question: A formalism used in this technique uses a pulse sequence and a gradient field to encode spatial information which is Fourier transformed from the k-space image. Since they lower T1 relaxation times, paramagnetic substances such as gadolinium are commonly used as contrast agents in this technique. Seiji Ogawa developed a form of this technique which uses BOLD contrast to observe blood flow in the brain. This technique with a "functional" variety targets hydrogen nuclei found in the water in most tissues, and does not use ionizing radiation like CT scans do. For 10 points, name this medical imaging technique which uses a magnetic field to visualize the body.
first_sentence: A formalism used in this technique uses a pulse sequence and a gradient field to encode spatial information which is Fourier transformed from the k-space image.
raw_answer: MRI [or nuclear magnetic resonance imaging; or functional magnetic resonance imaging; or f-MRI]