This blog post explores how the development of medical imaging technology enhances diagnostic accuracy and improves treatment safety.
Introduction
In hospitals, diagnosis is just as crucial as direct treatment. The cause of a disease must be identified as accurately and swiftly as possible. Since diagnostic accuracy directly impacts patient outcomes, radiology plays a particularly vital role in this process. Radiology is also called the Department of Radiology because it primarily handles medical radiography. Advances in radiology have enabled physicians to visualize the body’s interior without surgical intervention, significantly improving diagnostic accuracy. Visually assessing a patient’s condition is essential for planning surgeries or treatments, and radiology stands at the heart of this diagnostic process.
Radiologists analyze images obtained through imaging to gather extensive information about a patient’s condition. For example, they can observe fractured bones or tumors within the lungs, using this information to formulate appropriate treatment plans. This process requires radiologists to possess not only technical knowledge but also a high level of anatomical understanding and analytical skills. Their judgments must be accurate to ensure patients recover more quickly and effectively.
Furthermore, since the human body reacts very sensitively to external stimuli, accurately identifying the problem and minimizing physical stress is ideal. This is especially critical during surgical procedures, as the body is exposed externally for extended periods. There is no time to waste opening the body to search for the cause of the disease. Therefore, gathering all information about the patient’s condition beforehand is crucial. This information acts as a key factor determining the success of the surgery. In this blog post, we will explore the operating principles and advantages/disadvantages of three representative devices used in radiology.
X-Ray
X-ray is a technology that uses relatively high-energy wavelengths, specifically X-rays within the electromagnetic spectrum, to visualize the body. When X-rays are briefly directed at the body, the high-energy X-rays pass through it and are captured on photographic film on the opposite side. During this process, different materials within the body absorb varying amounts of X-rays. For example, calcium in bones, having a relatively high atomic number, absorbs more X-rays, while muscle tissue, being protein, absorbs less. Consequently, areas like bones, which absorb more X-rays, cast a darker shadow, appearing white on the X-ray image. X-rays can be easily absorbed by materials with lower density than bone, depending on their intensity, making it crucial to measure precise values when taking images.
The advantages of X-rays are their relative ease and convenience of use, along with the low cost of the equipment. This allows for the rapid detection of issues like bone fractures or cancer. Moreover, X-rays provide rapid results in emergency situations, making them particularly useful for patients requiring immediate treatment. However, since radiation must be directed directly at the body, prolonged exposure or multiple examinations can increase the risk of cancer. This makes X-rays especially dangerous for young children. Despite the potential risks of radiation, X-rays remain essential in many medical settings, and their importance is unlikely to diminish anytime soon.
CT (Computed Tomography)
CT scans also utilize X-rays. However, unlike simple two-dimensional X-ray images, CT scans combine X-rays from multiple angles processed by a computer to visualize cross-sections of the body without incision. CT provides detailed cross-sectional images, aiding physicians in making more accurate diagnoses. Before the exam, the patient swallows a contrast agent (such as barium or iodine). This substance has the property of not allowing radiation to pass through it, enhancing the contrast in the images and enabling a more precise diagnosis. CT can capture even low-density soft tissue, which is invisible on X-rays, with great detail and speed.
A key advantage of CT is its ability to reliably distinguish between body tissues with as little as a 1% difference in density. CT offers high-resolution imaging. For example, if a section of the brain appears a different color on a cross-section, it indicates the presence of tissue other than brain tissue. CT scans take longer and expose patients to higher levels of radiation than X-rays. Therefore, patients who undergo multiple scans face higher risks, and in children specifically, the probability of developing leukemia and brain tumors increases threefold. Despite these risks, CT remains an essential tool for clearly visualizing the body’s complex internal structures, making it indispensable for diagnosing complex diseases and planning treatments. Additionally, a significant number of people experience allergic reactions to the contrast agents used in CT scans. For these reasons, CT scans must be used cautiously, and considering alternative tests when necessary is crucial.
MRI (Magnetic Resonance Imaging)
MRI is a technology based on the principle that hydrogen atoms begin to interact with a magnetic field when exposed to a strong one. Hydrogen atoms within the magnetic field absorb energy. When the magnetic field is removed, they return to their original ground state and emit electromagnetic waves. Our bodies contain about 60% body fluid, mostly water, making them rich in hydrogen ready to be excited. The MRI machine repeatedly turns a strong magnetic field on and off, exciting and de-exciting the hydrogen atoms. Sensors then combine the intensity and speed of the emitted electromagnetic waves to create cross-sectional images of the body. This is likely why MRI scans take significantly longer than X-rays or CT scans.
The major advantage of MRI is that it uses no radiation, eliminating any radiation-related risks. This is particularly beneficial for radiation-sensitive individuals like pregnant women or patients requiring repeated scans. Furthermore, MRI produces more detailed images than X-rays or CT scans and can visualize structures like cartilage and soft tissue that are difficult to see with X-rays. However, because MRI utilizes magnetic fields, no metallic objects are permitted inside the machine during the scan. Consequently, patients who have undergone heart surgery or have artificial implants in their bodies cannot undergo the test. Furthermore, the loud noises generated as the magnetic field is turned on and off can be unpleasant for patients. The requirement to remain still for an extended period in a confined space makes it unsuitable for patients with claustrophobia. Despite these drawbacks, MRI holds significant value as a highly accurate examination with no risk of radiation exposure. Unfortunately, its high cost is a major disadvantage. This financial burden often causes patients to hesitate about undergoing an MRI scan.
Future of Medical Imaging
Beyond these three imaging methods, radiology employs various other technologies for patient diagnosis. Advancements in medical imaging technology enhance diagnostic precision and play a crucial role in patient treatment. Mobilizing these technologies, medical professionals have conducted extensive research on the human body, leading to the development of new treatment methods and diagnostic techniques. The progress of 21st-century science continues to yield new and safer imaging techniques. For instance, the development of more sensitive sensors is advancing technologies that minimize radiation exposure. This allows for obtaining higher-resolution images with less radiation exposure than before.
Furthermore, through the emerging field of nanomolecular imaging, Theragnosis (therapy + diagnosis) technology is advancing, enabling both the confirmation of the presence of targeted cell tissue and treatment simultaneously. This technology is generating significant anticipation as it targets specific cancer cells, allowing for early cancer diagnosis and treatment at the same time. Furthermore, technology has been developed that allows the location of tumors to be directly observed with the naked eye by injecting luminescent substances, eliminating the need for imaging. As medical imaging advances in this way, physicians will be able to provide more comprehensive care using less invasive methods. Moreover, surgery can be performed only on patients who truly require it, reducing unnecessary risks. Advanced imaging technology will reduce misdiagnoses and medical errors, allowing patients to undergo a single accurate test instead of multiple procedures. These advancements will ultimately contribute to providing higher-quality medical services at more realistic prices. In the future, integration with artificial intelligence (AI) technology will enable even more sophisticated diagnostics and treatment planning, bringing significant changes to the medical field.
