The aim of study is to find out how measuring the absorbed dose depends on the different axial scanning technologies and how they affect the measured value using standard dose test method with CT dose head and body phantoms. Computed tomography one of the most pressing tasks is to dose reduction. Parameters associated with received radiation doses and depend on the hardware technical support are: slice thickness, the distance between slice, interlayer, examination region, exposure factor and gantry tilt. Image quality and radiation dose affect patient received dose in examination. Computed tomography manufacturers given base CT Dose Index (CTDI) values are highly dependent on scanning parameters and characteristics of the scanner. Therefore image quality and radiation dose affect patient received dose in examination and it may not always be assessed quantitatively, when measured with CT dose test phantoms. However, to achieve this objective requires more and more new approaches for the determination of the dose rate CT, and in assessing the information provided by different manufacturers, firstly, of the CT dose index (CTDI), that can compare with the standard methods and the assessment of the patient dose. To determinate CT dose index in CT dose phantom there are nothing says about the limits of the scan length of the phantoms, not exceed the permissible uncertainty related to possible scatter of the phantom side the edge. The aim of study was to find out how during measuring the absorbed dose in phantoms depends on the different axial scanning technology and the changing nature of the measured value over all phantom length using standard CT phantoms and as well clarify difference between measured weighted CT dose index and the given manufacturer (base) values.