Coronal multiplanar reconstruction view from isotropic voxel data sets obtained with multidetector-row CT: assessment of detection and size of mediastinal and hilar lymph nodes.
OBJECTIVE
To assess the detection and size of mediastinal and hilar lymph nodes by multiplanar reconstruction (MPR) view from isotropic voxel data sets obtained with multidetector-row computed tomography (MDCT).


METHODS
Thin-section CT of 27 patients with mediastinal or hilar lymph node swelling was obtained with a 25.6-cm FOV, 512 x 512 matrix, and two protocols: A) 0.5-mm collimation, 0.3-mm interval, and B) 2-mm collimation, 1-mm interval. MPR views with a 0.5-mm slice thickness were obtained from these two data sets. Postcontrast axial CT used 5-mm collimation (set C). Two observers evaluated the presence and cranio-caudal length of swollen lymph nodes. Two other board-certified chest radiologists evaluated all three sets and established a gold standard by consensus.


RESULTS
The accuracy of detection was 76%, 73%, and 68% for sets A, B, and C, respectively. There was a significant difference between sets A and C (McNemar's test: p<0.05) but not between sets A and B or B and C (p>0.05). The cranio-caudal length of lymph nodes was significantly correlated with the gold standard only in set A (Pearson's correlation coefficient: r=0.53, p<0.05).


CONCLUSIONS
Non-contrast enhanced coronal MPR views constructed from isotropic voxel data sets may be substituted for axial enhanced CT for the evaluation of mediastinal and hilar lymph nodes.
Kozuka
Takenori
T
Department of Radiology, Osaka University Graduate School of Medicine, Japan.
Tomiyama
Noriyuki
N
Johkoh
Takeshi
T
Honda
Osamu
O
Koyama
Mitsuhiro
M
Hamada
Seiki
S
Nakamura
Hironobu
H
Yamamoto
Shuji
S
Matsumoto
Takashi
T
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008198:Lymph Nodes / Q000000981:diagnostic imaging / Q000473:pathology; D008206:Lymphatic Diseases / Q000175:diagnosis / Q000453:epidemiology; D008223:Lymphoma / Q000175:diagnosis / Q000453:epidemiology; D008297:Male; D008482:Mediastinum / Q000000981:diagnostic imaging / Q000473:pathology; D008875:Middle Aged; D015588:Observer Variation; D012507:Sarcoidosis / Q000175:diagnosis / Q000453:epidemiology; D013223:Statistics as Topic; D014057:Tomography, X-Ray Computed