To dismantle the assumption of proportionality between CT numbers and element mass, emphasizing the potential errors in elemental quantification and their clinical implications.
Key Findings:
CT numbers are not proportional to element mass in vivo, leading to potential misdiagnoses.
CT numbers are proportional to element mass only in pure water, which is rarely the case in clinical settings.
Iodine-water material decomposition is inaccurate in vivo, affecting treatment decisions.
Error-free material decomposition requires a voxel to consist solely of basis decomposition vectors, which is often not achievable.
Interpretation:
Misinterpretations of CT numbers can lead to significant errors in quantifying elements like iodine and hydroxyapatite, adversely affecting clinical diagnostics and patient outcomes.
Limitations:
Current understanding lacks a QIBA profile for CT number accuracy or material density, hindering standardization.
Errors may persist despite calibration procedures, indicating a need for improved methodologies.
Conclusion:
Understanding the limitations of CT number assumptions is crucial for improving elemental quantification in clinical settings and enhancing diagnostic accuracy.
