The adrenal adenoma calculator is a specialized tool designed for medical professionals to evaluate adrenal lesions based on radiological data obtained from computed tomography (CT) scans. Its primary functions are to determine the absolute and relative washout values of an adrenal lesion, which are instrumental in differentiating adenomas from other adrenal masses.
Formula of Adrenal Adenoma Calculator
Absolute Washout: Absolute washout is calculated using the following formula:
Absolute Washout = 100 × [(Post HU - Delayed HU) / (Post HU - Pre HU)]
Relative Washout: Relative washout is calculated with this formula:
Relative Washout = 100 × [(Post HU - Delayed HU) / Post HU]
In these formulas:
- Post HU refers to the Hounsfield Units (HU) of the adrenal lesion on an early contrast-enhanced CT scan.
- Delayed HU refers to the HU of the adrenal lesion on a delayed CT scan.
- Pre HU refers to the HU of the adrenal lesion on a non-contrast CT scan.
These values provide a quantitative assessment of the lesion’s enhancement characteristics, helping to distinguish between benign and malignant adrenal masses.
General Terms and Calculations
| Term | Description |
|---|---|
| Absolute Washout | A value indicating the degree of contrast washout in an adrenal lesion, often used for diagnosis. |
| Relative Washout | A value representing the percentage of contrast washout, aiding in the differentiation of adrenal lesions. |
| Hounsfield Units (HU) | A measurement unit used in CT scans to quantify the density of tissues, including adrenal lesions. |
| Contrast-Enhanced CT | A diagnostic imaging technique that uses a contrast agent to enhance the visibility of tissues and lesions in CT scans. |
Example of Adrenal Adenoma Calculator
Let’s put the formula into action with a practical example:
Suppose we have the following Hounsfield Unit (HU) values:
- Post HU: 80
- Delayed HU: 60
- Pre HU: 40
Absolute Washout: Absolute Washout = 100 × [(80 – 60) / (80 – 40)] = 100 × (20 / 40) = 50%
Relative Washout: Relative Washout = 100 × [(80 – 60) / 80] = 100 × (20 / 80) = 25%
In this scenario, the absolute washout is 50%, and the relative washout is 25%.
Most Common FAQs
The adrenal adenoma calculator is used to assess adrenal lesions in CT scans, helping medical professionals differentiate between benign and malignant masses.
The results provide quantitative values, including absolute and relative washout percentages, which are key in characterizing adrenal lesions.