The use of contrast, hypodensity can signal injuries such as hematomas, benign and malignant nodules. Throughout this article, I show some examples and points of attention. Read until the end to also learn about the advantages of opting for the tomography report via telemedicine. What is hypodense CT image? A hypodense image on CT scans is one that appears darker than the surrounding images. To explain it better, let’s go to a definition about the formation of images by the CT scanner. It occurs from values resulting from density obtained by passing a thin beam of X-rays through the examined area. Higher density structures appear clear, while lower density (hypodense) structures appear in dark gray tones. Or even in black, like air. The reference behind the coloring of structures in images obtained by CT is called a density table.
The scale for measuring densities is based
On the density of water, which was assigned the value zero; starting from this premise, the air density was -1000, and the cortical bone, +1000. The unit of value was defined as Hounsfield (UH), in honor of the English engineer who invented the tomography device. The pattern allowed Hong Kong Phone Numbers List all structures to gain comparable density values. See examples below: Plasma: 25 to 29 UH Blood: 50 to 60 UH Kidney: 20 to 40 UH Brain: 20 to 35 UH Lung: -300 to -900 UH. Now that you know what a hypodense CT image is, let’s see what differentiates it from. What is the difference between hypodense and images in tomography? The difference is in the tone of the image. While the hypodense is portrayed in a dark tone, the hyperdense image appears clear in the tomographic records.
In a simple way we can say that a structure
Has a higher density compared to a hypodense one, which confers color differentiation. It is noteworthy that the same structure can be hypodense in a given context, and hyperdense in another. After all, this classification is given according to the comparison with the DD Leads surrounding structures. How to identify a hypodense image on tomography? So far, you have seen what a hypodense CT image is and why it deserves attention in the interpretation of the exam. But how does its identification occur? According to a material from the University of São Paulo (USP): “We must analyze an image exam with a method, using a semiological routine similar to the one we use in the clinic, to examine the patient. In CT, we begin to examine the density of the lesion, comparing it with the structure where it is located.