Purpose
To evaluate the difference of mixed energy mode and mono-energy mode reconstruction images on abdomen spectral CT imaging.
Methods and Materials
Abdomen three phases enhanced CT scans were applied with spectral imaging technique (Discovery CT 750 HD,
GE Healthcare) on seventy six patients.
Images were reconstructed by two mode: mixed-energy mode,
and 70KeV mono-energy mode.
The following variables were compared: signal-to-noise ratio (SNR) of liver,
spleen ,
gallbladder,
kidney and pancreas; orgen-to-fat contrast-to-noise ratio (CNR) of liver,
spleen,
gallbladder,
kidney and pancreas; noise.
Paired t tests were used to compare differences between the two modes.
Three experienced doctors independently evaluate the artifact level of images of...
Results
Compared with mixed-energy mode images,
70KeV mono-energy mode images yielded significantly greater SNR,
tissue-to-fat CNR and noise (p<0.05 for all comparison).
The image quality of 70KeV mono-energy mode showed significant difference compared with mixed-energy mode(P=0.000).
Conclusion
In abdominal spectral CT imaging,
mono-energy reconstruction can provide better quality images; can replace mixed-energy images in clinical diagnosis.
References
[1] Hopper KD,
Keeton NC,
Kasales CJ,
et al.
Utility of low mA 1.5 pitch helical versus conventional high mA abdominal CT.
Clin Imaging.
1998,
22(1): 54-59.
[2] Karcaaltincaba M,
Aktas A.
Dual-energy CT revisited with multidetector CT: review of principles and clinical applications.
LID - 10.4261/1305-3825.DIR.3860-10.0 [doi].
Diagn Interv Radiol.
2010 .
[3] Funama Y,Awai K,Nakayama Y,et al.
Radiation dose reduction without degradation of low-contrast detectability at abdominal multisection CT with a low-tube voltage technique: phantom study.
Radiology,2005,237(3):905–910