HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Zhu, X. Articles by Huang, Z. Search for Related Content PubMed PubMed Citation Articles by Zhu, X. Articles by Huang, Z. Social Bookmarking                      What's this? Hotlight (NEW!) What's Hotlight?

Low-Dose Chest CT: Optimizing Radiation Protection for Patients

¹ Department of Radiology, Shanghai Pneumology Hospital, Shanghai, People's Republic of China.
² Department of Radiology, First Affiliated Hospital of Hua-xi Medical Center, West China University of Medical Sciences, Shichuan, People's Republic of China.
³ HealthONE Alliance, 5125 Stapleton Dr. N, Denver, CO 80216.

View larger version (82K): [in a new window]   Fig. 1A. —CT scans obtained in 78-year-old man illustrate criteria used to rate image quality. CT scan is normal-quality image (i.e., no artifact).

View larger version (108K): [in a new window]   Fig. 1B. —CT scans obtained in 78-year-old man illustrate criteria used to rate image quality. CT scan shows mild artifact (i.e., not affecting ability to accurately diagnose).

View larger version (127K): [in a new window]   Fig. 1C. —CT scans obtained in 78-year-old man illustrate criteria used to rate image quality. CT scan shows severe artifact (i.e., affecting ability to accurately diagnose).

View larger version (15K): [in a new window]   Fig. 2. —Graph illustrates relationship between image quality of CT scans obtained in patients (indicated as percentage of normal CT scans) and milliampere-seconds values for 8-mm slice thickness and relationships between CT dose index (CTDI) (normalized to 115 mAs) and milliampere-seconds values. Solid line is linear regression of measured CTDI. Note image quality curve falls quickly at inflection point of 25 mAs. = CTDI, = mediastinal window setting (level, 50 H; width, 400 H), = lung window setting (level, 500 H; width, 1200 H), r2 = 0.997.

View larger version (15K): [in a new window]   Fig. 3. —Graph illustrates relationship between image quality of CT scans obtained in patients (indicated as percentage of normal CT scans) and milliampere-seconds values for 3-mm slice thickness, and the relationships between CT dose index (CTDI) (normalized to 115 mAs) and mAs. Solid line is linear regression of measured CTDI. Note image quality curve falls quickly at inflection point of 25 mAs. = CTDI, = mediastinal window setting (level, 50 H; width, 400 H), = lung window setting (level, 500 H; width, 1200 H), r2 = 0.994.

View larger version (100K): [in a new window]   Fig. 4A. —Transverse CT scans obtained at different milliampere-second settings show mass on lower lobe of right lung on 74-year-old man. Both scans were rated as normal-quality images. Transverse CT scans were obtained at 115 mAs (150 mA) (A) and 25 mAs (30 mA) (B).

View larger version (103K): [in a new window]   Fig. 4B. —Transverse CT scans obtained at different milliampere-second settings show mass on lower lobe of right lung on 74-year-old man. Both scans were rated as normal-quality images. Transverse CT scans were obtained at 115 mAs (150 mA) (A) and 25 mAs (30 mA) (B).

View larger version (60K): [in a new window]   Fig. 5A. —Coronal maximum-intensity-projection images reconstructed from CT scans obtained at different milliampere-second settings shows cavitation on upper lobe of right lung in 50-year-old man. Both were rated as normal-quality images. Maximum-intensity-projection images were derived from scans obtained at 115 mAs (150 mA) (A) and at 25 mAs (30 mA) (B).

View larger version (64K): [in a new window]   Fig. 5B. —Coronal maximum-intensity-projection images reconstructed from CT scans obtained at different milliampere-second settings shows cavitation on upper lobe of right lung in 50-year-old man. Both were rated as normal-quality images. Maximum-intensity-projection images were derived from scans obtained at 115 mAs (150 mA) (A) and at 25 mAs (30 mA) (B).

View larger version (125K): [in a new window]   Fig. 6A. —Three-dimensional images reconstructed from CT scans obtained at different milliampere-second settings show nodules on lower lobe of left lung in 46-year-old man. Both are rated as normal-quality images. Three-dimensional images were derived from scans obtained at 115 mAs (150 mA) (A) and at 25 mAs (30 mA) (B).

View larger version (148K): [in a new window]   Fig. 6B. —Three-dimensional images reconstructed from CT scans obtained at different milliampere-second settings show nodules on lower lobe of left lung in 46-year-old man. Both are rated as normal-quality images. Three-dimensional images were derived from scans obtained at 115 mAs (150 mA) (A) and at 25 mAs (30 mA) (B).

View larger version (75K): [in a new window]   Fig. 7A. —CT virtual endoscopic images reconstructed from scans obtained at two different milliampere-second settings in 67-year-old man. Both were rated as normal-quality images. CT virtual endoscopic images obtained at 187 mAs (250 mA) (A) and 40 mAs (50 mA) (B) show extramural (left side of each image) and endobronchial (right side of each image) views of tracheal bronchus. Endobronchial view was in trachea above carina looking into main stem bronchi. Stenosis due to enlarged mediastinal lymph node allows only carina and left main bronchi to be seen.

View larger version (79K): [in a new window]   Fig. 7B. —CT virtual endoscopic images reconstructed from scans obtained at two different milliampere-second settings in 67-year-old man. Both were rated as normal-quality images. CT virtual endoscopic images obtained at 187 mAs (250 mA) (A) and 40 mAs (50 mA) (B) show extramural (left side of each image) and endobronchial (right side of each image) views of tracheal bronchus. Endobronchial view was in trachea above carina looking into main stem bronchi. Stenosis due to enlarged mediastinal lymph node allows only carina and left main bronchi to be seen.

CiteULike

Complore

Connotea

Del.icio.us

Digg

Reddit

Technorati