Abstract：
PURPOSE:To clarify whether the benefit of a reduced effective scan width obtained using a smaller pitch outweighs the disadvantage of increased noise in the application of a subsecond helical CT to mass screenings for lung cancer. MATERIALS AND METHODS:Twenty-two helical CT scans of the lung were obtained in 11 healthy subjects using the following parameters: 1) scan 1 was performed at 120 kVp, 50 mA, 10-mm collimation, 1-second/rotation, helical pitch of 2.0; and 2) scan 2 was performed at 120 kVp, 50 mA, 10-mm collimation, 0.75-second/rotation, helical pitch of 1.5. Computer-generated nodules measuring 10 mm and 6 mm in diameter showing ground-glass opacity were superimposed on these images. The detectability of each nodule was evaluated by six blinded readers using ROC analysis. RESULTS:Detectability of the 6-mm nodules was significantly higher in scan 2 than in scan 1. Detectability of the 10-mm nodules was not significantly different between scans 1 and 2. CONCLUSION:The use of a smaller pitch by employing a subsecond rotation scan in a helical CT for lung cancer screenings improves the detection of small lesions without increasing either the scanning time or radiation dose.
journal_name
Nagoya J Med Scijournal_title
Nagoya journal of medical scienceauthors
Mori Y,Itoh S,Ikeda M,Sawaki A,Suzuki K,Iwano S,Satake H,Arahata S,Ota T,Ishigaki Tsubject
Has Abstractpub_date
2006-06-01 00:00:00pages
139-45issue
3-4eissn
0027-7622issn
2186-3326journal_volume
68pub_type
杂志文章abstract：:Stereotactic radiosurgery for large brain metastases (BM) not amenable to surgical resection is associated with limited local control and neurotoxicity, while hypofractionated stereotactic radiotherapy (HFSRT) has emerged as a promising option. We retrospectively evaluated 61 patients with BM larger than 2 cm in the m...
journal_title：Nagoya journal of medical science
pub_type： 杂志文章
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journal_title：Nagoya journal of medical science
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journal_title：Nagoya journal of medical science
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journal_title：Nagoya journal of medical science
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pub_type： 杂志文章,评审
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journal_title：Nagoya journal of medical science
pub_type： 杂志文章,评审
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更新日期：1997-11-01 00:00:00
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journal_title：Nagoya journal of medical science
pub_type： 杂志文章,评审
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更新日期：1994-03-01 00:00:00
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journal_title：Nagoya journal of medical science
pub_type： 杂志文章
doi：10.18999/nagjms.79.4.443
更新日期：2017-11-01 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2015-02-01 00:00:00
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journal_title：Nagoya journal of medical science
pub_type： 杂志文章,评审
doi：
更新日期：1998-10-01 00:00:00
