[Image quality of paper prints compared to film copies in CT investigations].
OBJECTIVE
Evaluation of image quality of paper prints in routine CT investigations.


METHODS
The image quality of paper prints from 104 CT scans of daily routine investigations was analysed by three observer three observers according to a five-point ranking scale for contrast, grey level, spatial resolution, and subjective confidence in correct evaluation. Each study was rated "acceptable" or "not acceptable for documentation".


RESULTS
In 312 ratings the mean grade for contrast was 2.7, for grey levels 3.2, and for spatial resolution 3.3. Grades ranged from 1 = very good to 5 = insufficient. Subjective confidence in correct evaluation was rated as "certain" in 77.4 %, "likely" in 18.4 % and "impossible to evaluate" in 4.2 % of cases. 93.7 % of printed CT images were rated "acceptable for documentation".


CONCLUSIONS
Image quality of paper prints does not reach the quality of laser films concerning its contrast, grey levels, and spatial resolution. Nevertheless, paper prints are acceptable for documentation of findings in most CT investigations. A high confidence in correct evaluation was found. Limitations are found in documentation of small coin lesions of the lung and ischemic lesions of the neurocranium.
Bley
T
T
Abteilung Röntgendiagnostik, Radiologische Klinik, Universitätsklinikum Freiburg, Germany. bley@mrs1.ukl.uni-freiburg.de
Burger
D
D
Ghanem
N
N
Thürl
C
C
Saueressig
U
U
Kotter
E
E
Langer
M
M
D006801:Humans; D007834:Lasers; D010209:Paper; D011786:Quality Control; D014057:Tomography, X-Ray Computed / Q000592:standards*; D014962:X-Ray Film