Whole-brain perfusion imaging with 320-MDCT scanner: Reducing radiation dose by increasing sampling interval

Area of Science:

• Radiology
• Medical Imaging
• CT Technology

Background:

• Perfusion CT (CTP) is crucial for assessing tissue perfusion.
• Standard CTP protocols involve significant radiation exposure.
• Optimizing CTP protocols for dose reduction is an active area of research.

Purpose of the Study:

• To evaluate the diagnostic equivalence of CTP values derived from a reduced-radiation dose protocol.
• To compare CTP metrics obtained with a standard-dose protocol versus a half-dose protocol on a 320-MDCT scanner.

Main Methods:

• Utilized a 320-MDCT scanner for both standard and reduced-dose perfusion CT imaging.
• Employed an alternative reconstruction algorithm for the reduced-dose protocol.
• Analyzed and compared key perfusion parameters (e.g., cerebral blood volume, cerebral blood flow) between the two protocols.

Main Results:

• Perfusion CT values obtained with the reduced-dose protocol were found to be similar to those from the standard-dose protocol.
• The alternative algorithm facilitated the acquisition of comparable perfusion data at a lower radiation level.

Conclusions:

• Reduced-dose perfusion CT imaging on a 320-MDCT scanner can yield similar perfusion values compared to standard protocols.
• This approach offers a viable method for obtaining essential perfusion information while significantly reducing patient radiation dose.