Medicine has Flourished Since the Introduction of the Magnetic Renonance Imaging Unit
1638 WordsJan 30, 20187 Pages
Since the introduction of the magnetic resonance imaging unit, diagnostic medicine has flourished. The ability to see different pathologies in a detailed soft tissue image has helped guide doctors in providing patients with better treatment and therefore a better prognosis. In many cases, magnetic resonance imaging is the golden standard in diagnostic studies. This is especially true when studying blood vessels. The majority of doctors turn to a magnetic resonance angiography(MRA) method called bright blood imaging when they are concerned with any blood flowing vessels. A few main areas of concern include vessels in the brain, neck, thoracic, abdominal aorta, renals, and vessels in the legs called a “run off”. When doctors order an MRA using bright blood imaging they want to rule out serious pathologies such as aneurysms, aorta dissection, or stenosis. Bright blood imaging uses a strong magnetic field and specific pulse sequences. Below we will discuss three different techniques and their own unique advantages and disadvantages.
Time-of-flight(TOF) also called inflow angiography, is a non-invasive procedure that produces flow contrast. The more RF excitation pulses used in an image plane the more saturated the spins become so we want to limit the amount of RF pulses to the flowing spins by setting up thin slabs perpendicular to the vessels or blood flow. New blood is always flowing in and out of the slice, and because the spins only receive a few RF pulses, signal is