Unenhanced Helical CT Using Increased Pitch for Suspected Renal Colic: An Effective Technique for Radiation Dose Reduction?

Diel, Jack; Perlmutter, Steven; Venkataramanan, Natarajan Sathiyamoorthy; Mueller, Richard; Lane, Michael J.; Katz, Douglas S.

doi:10.1097/00004728-200009000-00023

Cited by 62 publications

(37 citation statements)

References 21 publications

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“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The researchers primarily evaluated the possibility of reducing the dose by increasing the pitch, 8 lowering the tube current, 9-11 using automatic tube current modulation, 12 reducing the tube voltage 13,14 and using iterative reconstruction algorithms. [13][14][15][16][17][18][19] Another simple and effective way to reduce the dose is to limit acquisition coverage from the top of the kidneys to the lower edge of the bladder.…”

Section: Introductionmentioning

confidence: 99%

Optimizing z-axis coverage of abdominal CT scans of the urinary tract: a proposed alternative proximal landmark for acquisition planning

Gervaise¹,

Teixeira²,

Hossu³

et al. 2016

BJR

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Objective: To evaluate an alternative method to reduce the acquisition coverage of urinary tract CT. Methods: This retrospective study included 365 abdominopelvic CT studies. Three radiographers simulated shortened acquisition coverages using three methods to determine the upper limit of the acquisition: Method 1 used the renal contours; Method 2 used the inferior margin of the 10th thoracic vertebra; and Method 3 used the point of intersection of the left diaphragmatic dome and the anterior margin of the vertebral bodies. Reductions in acquisition coverage and number of CT scans with a portion of the kidney excluded from the simulated reduced acquisition were compared between the three methods.Results: The mean 6 standard deviation reduction of acquisition coverage for the three readers with Methods 1, 2 and 3 were 20.5 6 4.8, 15.1 6 6.5 and 18.2 6 5.3%, respectively. Compared with Method 2, Method 3 allowed a mean scan length reduction of 3.6%. The proportions of CT scans with a portion of the kidney excluded from the simulated reduced acquisition with Methods 1, 2 and 3 and averaged over the three readers were 6.7, 0.7 and 1.4%, respectively, with no significant difference between Methods 2 and 3. Interreader and intrareader agreements were excellent with all methods, but interclass correlation coefficients were higher with Method 3. Conclusion: The method using the renal contours should not be used owing to its high proportion of kidneys with a portion excluded from the acquisition. Using the intersection of the left diaphragmatic dome and the anterior margin of the vertebral bodies for proximal landmark for urinary tract CT represents a new alternative method with a better reduction of scan length compared with the method using the inferior margin of T10 and with no significant increase in the number of kidneys with a portion excluded from the reduced acquisition. Advances in knowledge: A new method using the point of intersection of the left diaphragmatic dome and the anterior border of the vertebral bodies on the lateral scout radiograph is introduced to reduce the z-axis coverage of urinary tract CT scans.

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Section: Introductionmentioning

confidence: 99%

Optimizing z-axis coverage of abdominal CT scans of the urinary tract: a proposed alternative proximal landmark for acquisition planning

Gervaise¹,

Teixeira²,

Hossu³

et al. 2016

BJR

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“…Several dose-reduction techniques, such as tube current modulation [5], reduced tube voltage [6], use of a higher pitch [7] and noise reduction filters [8], have been successfully implemented and have been shown to reduce radiation exposure. However, further reductions in radiation dose are hindered by increased image noise and degraded image quality, mainly as a result of limitations of the standard filtered back projection (FBP) reconstruction algorithm currently used on most CT systems.…”

Section: Introductionmentioning

confidence: 99%

Model-based iterative reconstruction technique for radiation dose reduction in chest CT: comparison with the adaptive statistical iterative reconstruction technique

et al. 2012

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“…As for pitch, an increase in pitch decreases duration of examination and also decreases radiation exposure to the body. Although increase of pitch causes helical artifacts and decreased spatial resolution, some investigators have reported using a pitch of 2 or above with satisfactory results in cases of suspected renal colic (20,21).…”

Section: Radiation Dose Optimization and Dose Reduction: Alara (As Lomentioning

confidence: 99%

MDCT technique and imaging findings of urinary stone disease: an expanded review

Türkbey

Akpınar²,

Özer³

et al. 2008

Diagn Interv Radiol

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Unenhanced Helical CT Using Increased Pitch for Suspected Renal Colic: An Effective Technique for Radiation Dose Reduction?

Cited by 62 publications

References 21 publications

Optimizing z-axis coverage of abdominal CT scans of the urinary tract: a proposed alternative proximal landmark for acquisition planning

Optimizing z-axis coverage of abdominal CT scans of the urinary tract: a proposed alternative proximal landmark for acquisition planning

Model-based iterative reconstruction technique for radiation dose reduction in chest CT: comparison with the adaptive statistical iterative reconstruction technique

MDCT technique and imaging findings of urinary stone disease: an expanded review

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