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PubMed · 14981835

[Optimal scanning collimation for segmental bronchi: experimental study with low-dose helical CT].

Jian-qun Yu·Zhi-gang Yang·Zhen-lin Li·Xian Chen
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Abstract

OBJECTIVE: To evaluate the effects of low-dose helical CT with different scanning collimation on the visualization of segmental bronchi and to determine the optimal scanning collimation in CT screening for early central lung cancer. METHODS: Forty healthy volunteers were randomly assigned to undergo the low-dose helical CT at 120 kVp, 50 mA, 0.75 s and pitch 1. One group (n = 20) underwent the sequential subsection scan of chest with the collimation of 10 mm for the apical and basilar zone, and of 8 mm and 5 mm for the hilar zone. The other (n = 20) went through CT scan with 10 mm collimation of the whole lung. The visualizations of lobar, segmental bronchi were compared at different collimations. ANOVA and multiple comparison were performed. RESULTS: The visualization of segmental bronchi on low-dose scan at 10 mm collimation was 60%, being lower than that at 8 mm (88%) or 5 mm (91%) collimation (P < 0.01). The segmental bronchi of right upper lobe were easily identified at collimation of 10 mm (82%), 8 mm (96%) and 5 mm (98%), as well as those of left upper lobe at 10 mm (83%), 8 mm (95%) and 5 mm (97%), whereas those of lingular lobe were difficultly identified at 10 mm (30%), 8 mm (60%) and 5 mm (70%). CONCLUSION: The lobar and segmental bronchi were visualized reliably by CT with 50 mA and 8 mm collimation, and therefore the sequential subsection scan of chest divided into three zones can be adapted to CT screening for early lung cancer.

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AdultAgedBronchiFemaleHumansLungLung NeoplasmsMaleMass ScreeningMiddle AgedRadiation DosageTomography, Spiral ComputedClinical TrialJournal ArticleRandomized Controlled TrialResearch Support, Non-U.S. Gov't

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Jian-qun Yu, Zhi-gang Yang, Zhen-lin Li, Xian Chen. 2004. [Optimal scanning collimation for segmental bronchi: experimental study with low-dose helical CT].. https://pubmed.ncbi.nlm.nih.gov/14981835/

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