Videotaped helical CT images for lung cancer screening.
OBJECTIVE
The goal of this work was to determine a radiologist's ability to detect solitary pulmonary nodules on helical CT using both video (cine) viewing and film-based viewing.


METHODS
Sixty-five chest helical CT studies were reviewed. Six radiologists searched for 40 lung nodules on CT images presented in three formats. Film-based viewing of images at 10 and 5 mm increments was performed with a light box. Video viewing of the same examinations was performed in 5 mm increments at 2 frames/s. The area under the receiver operating characteristic curve (Az) measured the observer's ability to detect nodules.


RESULTS
The Az was 0.948 for the video viewing, 0.844 for 5 mm increment film-based viewing, and 0.879 for 10 mm increment film-based viewing. There were no statistically significant differences.


CONCLUSIONS
Lung nodules can be detected with similar detection rates when viewing conventional film or videotaped helical CT images. Videotaped images incur a lower cost, an important consideration in mass screening for lung cancer.
Iwano
S
S
Department of Radiology, Toyota Memorial Hospital, Aichi, Japan. shingo_iwano@mail.toyota.co.jp
Makino
N
N
Ikeda
M
M
Itoh
S
S
Ishihara
S
S
Tadokoro
M
M
Ishigaki
T
T
D000230:Adenocarcinoma / Q000000981:diagnostic imaging*; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D018288:Carcinoma, Small Cell / Q000000981:diagnostic imaging*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging; D008297:Male; D008403:Mass Screening / Q000191:economics / Q000295:instrumentation; D008875:Middle Aged; D015588:Observer Variation; D011237:Predictive Value of Tests; D012372:ROC Curve; D012680:Sensitivity and Specificity; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000191:economics / Q000295:instrumentation / Q000379:methods*; D014743:Videotape Recording / Q000191:economics