Low Kilovoltage CT of the Neck with 70 kVp: Comparison with a Standard Protocol

Gnannt, Ralph; Winklehner, Anna; Goetti, Robert; Schmidt, Bernhard; Kollias, Spyros; Alkadhi, Hatem

doi:10.3174/ajnr.a2910

Cited by 57 publications

(38 citation statements)

References 15 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, 80-kVp neck CT can still be expected to result in a distinct dose reduction. 16 DECT may result in a slower scan speed than certain single-or dual-source CT systems, which may lead to more motion artifacts, which were a potential exclusion criterion in our study. Third, there were far more SCC-related examinations included than the other subgroups.…”

Section: Discussionmentioning

confidence: 99%

“…[13][14][15] However, only a few prior studies evaluated low-tube-voltage CT acquisitions for imaging the soft-tissue structures of the neck region. [16][17][18] Gnannt et al 16 demonstrated that the consecutive increase in soft-tissue attenuation on 70-kVp scans is higher than the corresponding increase in image noise, therefore resulting in a superior contrastto-noise ratio for neck imaging. They reported a dose reduction of 34% with 70-kVp acquisitions compared with standard 120-kVp acquisitions.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, these limitations may be mitigated with the recently introduced third-generation dualsource CT. 20 Prior studies have also demonstrated that low-tube-voltage neck CT results in a superior contrast-to-noise ratio compared with 120-kVp scans. 16,18 Because patients with neck SCC often undergo multiple CT examinations and radiation therapy, the benefit for this specific patient group from low-tube-voltage acquisitions may be limited. Nevertheless, younger patients with suspected or known lymphoma and patients in whom primary neck SCC can be ruled out on the basis of CT findings may particularly benefit from a dose-saving 80-kVp CT technique.…”

Section: Discussionmentioning

confidence: 99%

“…[13][14][15] However, only a few studies have investigated low-tubevoltage acquisition CT techniques for imaging of the neck. [16][17][18] We hypothesized that an 80-kVp acquisition may provide comparable image quality for evaluation of the neck region. To evaluate the efficacy of this technique in simulated routine clinical practice, we retrospectively assessed the diagnostic accuracy of low-tube-voltage 80-kVp image series from dual-energy neck CT (DECT) for evaluation of a variety of cervical pathologies, and the results were compared with linearly blended images representing a standard 120-kVp acquisition.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Low-Tube-Voltage 80-kVp Neck CT: Evaluation of Diagnostic Accuracy and Interobserver Agreement

Wichmann

Kraft

Nöske

et al. 2014

AJNR Am J Neuroradiol

View full text Add to dashboard Cite

BACKGROUND AND PURPOSE: Low-tube-voltage acquisition has been shown to facilitate substantial dose savings for neck CT with similar image contrast compared with standard 120-kVp acquisition. However, its potential for the detection of neck pathologies is uncertain. Our aim was to evaluate the effects of low-tube-voltage 80-kV(peak) acquisitions for neck CT on diagnostic accuracy and interobserver agreement.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Low-Tube-Voltage 80-kVp Neck CT: Evaluation of Diagnostic Accuracy and Interobserver Agreement

Wichmann

Kraft

Nöske

et al. 2014

AJNR Am J Neuroradiol

View full text Add to dashboard Cite

show abstract

“…Automatic exposure control automatically adapts the tube current according to patient attenuation and has demonstrated dose reductions in the region of 20-40% without loss of image quality. 1,6,[10][11][12] However, tube voltage has a larger influence on radiation dose than current, and some studies have indicated that low voltage is useful for facilitating reductions in radiation dose 6,[13][14][15][16][17][18][19] and quantity of contrast material. 19 Because the patients' sizes and examination sites differ between individual patients, however, it is difficult for a physician to choose the best voltage for any particular patient.…”

Section: Introductionmentioning

confidence: 99%

Radiation dose and image quality with abdominal computed tomography with automated dose-optimized tube voltage selection

Wang

Hou

et al. 2014

J Int Med Res

View full text Add to dashboard Cite

Objectives: This study assessed image quality and radiation dose of multidetector computed tomography (CT) examination using a standard protocol and a low-voltage protocol. Methods: Patients requiring contrast-enhanced abdominal CT examination were randomly assigned to two groups with different voltage protocols: (i) 120 kV; (ii) an automated attenuationbased tube potential optimization mode (CARE kV). The volume CT dose index (CTDI vol ) and dose length product (DLP) were recorded. Image quality was semiquantitatively assessed by two blinded radiologists using a five-point scale.Results: There were 39 patients in the 120 kV group and 50 patients in the CARE kV group. There was no obvious difference in image quality score between the groups. CARE kV resulted in a voltage reduction to 100 kV in 45 patients and to 80 kV in five patients. CTDI vol and DLP were significantly lower with CARE kV than with the 120 kV protocol. Conclusions: The use of CARE kV reduces radiation dose with no loss of image quality compared with a standard 120 kV protocol.

show abstract

Optimization of HU threshold for coronary artery calcium scans reconstructed at 0.5‐mm slice thickness using iterative reconstruction

Hou

Tsujioka

Yang

2019

J Applied Clin Med Phys

View full text Add to dashboard Cite

Purpose This work investigated the simultaneous influence of tube voltage, tube current, body size, and HU threshold on calcium scoring reconstructed at 0.5‐mm slice thickness using iterative reconstruction (IR) through multivariate analysis. Regression results were used to optimize the HU threshold to calibrate the resulting Agatston scores to be consistent with those obtained from the conventional protocol. Methods A thorax phantom set simulating three different body sizes was used in this study. A total of 14 coronary artery calcium (CAC) protocols were studied, including 1 conventional protocol reconstructed at 3‐mm slice thickness, 1 FBP protocol, and 12 statistical IR protocols (3 kVp values*4 SD values) reconstructed at 0.5‐mm slice thickness. Three HU thresholds were applied for calcium identification, including 130, 150, and 170 HU. A multiple linear regression method was used to analyze the impact of kVp, SD, body size, and HU threshold on the Agatston scores of three calcification densities for IR‐reconstructed CAC scans acquired with 0.5‐mm slice thickness. Results Each regression relationship has R2 larger than 0.80, indicating a good fit to the data. Based on the regression models, the HU thresholds as a function of SD estimated to ensure the quantification accuracy of calcium scores for 120‐, 100‐, and 80‐kVp CAC scans reconstructed at 0.5‐mm slice thickness using IR for three different body sizes were proposed. Our results indicate that the HU threshold should be adjusted according to the imaging condition, whereas a 130‐HU threshold is appropriate for 120‐kVp CAC scans acquired with SD = 55 for body size of 24.5 cm. Conclusion The optimized HU thresholds were proposed for CAC scans reconstructed at 0.5‐mm slice thickness using IR. Our study results may provide a potential strategy to improve the reliability of calcium scoring by reducing partial volume effect while keeping radiation dose as low as reasonably achievable.

show abstract

Low Kilovoltage CT of the Neck with 70 kVp: Comparison with a Standard Protocol

Cited by 57 publications

References 15 publications

Low-Tube-Voltage 80-kVp Neck CT: Evaluation of Diagnostic Accuracy and Interobserver Agreement

Low-Tube-Voltage 80-kVp Neck CT: Evaluation of Diagnostic Accuracy and Interobserver Agreement

Radiation dose and image quality with abdominal computed tomography with automated dose-optimized tube voltage selection

Optimization of HU threshold for coronary artery calcium scans reconstructed at 0.5‐mm slice thickness using iterative reconstruction

Contact Info

Product

Resources

About