With the increasing use of digital breast tomosynthesis imaging, the accuracy and quality control of mammography systems is gaining importance because of the need for high image stability and quality. We focused on the accuracy and quality control of mammography systems using digital breast tomosynthesis and proposed a simple method of maintaining and controlling the accuracy of half-value layer (HVL) measurements. The European Reference Protocol for the Quality Control of the Physical and Technical Aspects of Digital Breast Tomosynthesis Systems guidelines state that HVL measurements should be performed annually; however, this would not reveal daily changes in X-ray output. Changes in HVL are important indicators for determining changes in tube voltage and considering radiation doses associated with radiography. We investigated a simple control method to measure HVL by photographing an aluminum step for routine quality control of mammography systems. The proposed HVL measurement on the aluminum step enables HVL measurement for short-term control. Moreover, it is inexpensive and allows for a straightforward evaluation of X-ray quality. Thus, this method can be used for simpler routine equipment management as the presence or absence of fluctuations can be confirmed with a single image of the aluminum step and by determining the dose.