Procedures for Evaluation of Slice Thickness in Medical Imaging Systems

Vermiglio, G.; Acri, Giuseppe; Testagrossa, Barbara; Causa, Federica; Tripepi, M. G.

doi:10.5772/23693

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…Slice thickness is one of the important parameters that determine image resolution among many parameters considered in a CT scan examination [4]. In the past, the slice thickness values were limited to the range of 5 to 10 mm [5], which could only show low-resolution images.…”

Section: Introductionmentioning

confidence: 99%

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An evaluation of automated measurement of slice sensitivity profile of computed tomography image: field of view variations

Widyanti

Anam²,

Hidayanto³

et al. 2023

IJEECS

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This study aims to evaluate the automated measurement of slice sensitivity profile (SSP) on the American Association of Physicists in Medicine (AAPM) computed tomography (CT) performance phantom for variations of slice thickness and field of view (FOV). The AAPM CT performance phantom was scanned using a Philips MRC 880 CT Scanner for variations of slice thickness and FOV. The slice thickness values were 1, 3, and 5 mm. The FOV values were 240, 300, 340, 400, and 440 mm. The automated SSPs and their fullwidth at half maximums (FWHMs) were automatically measured from the middle stair object of the phantom. To validate the automated measurement results, the FWHM values of SSPs obtained were compared to those from manual measurements. The differences between FWHMs from automated measurements and set slice thicknesses are less than 0.3 mm, while the differences between FWHMs from automated and manual measurements are less than 0.2 mm. The results from automated measurements are closer to the set slice thickness than those from manual measurements. This automated SSP measurement provides high accuracy and precision for both the slice thickness and the FOV variations.

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Section: Introductionmentioning

confidence: 99%

“…The SSP is a parameter that could be identified to evaluate the conditions of the CT system in quality control (QC) program. The SSP measurement can be performed using several types of phantoms [4]. The CatPhan and American College of Radiology (ACR) phantoms are commercial phantoms that are available for SSP measurements [11]- [14].…”

mentioning

confidence: 99%

An evaluation of automated measurement of slice sensitivity profile of computed tomography image: field of view variations

Widyanti

Anam²,

Hidayanto³

et al. 2023

IJEECS

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“…5 The slice thickness of CT usually ranges from submillimeter to 10 mm depending on the anatomy being imaged. 6 Slice thickness affects the longitudinal spatial resolution of the image 7 , which directly influences the ability to discriminate small objects or organs. 8 A thinner slice can be utilized to examine organs or small abnormalities in detail.…”

Section: Introductionmentioning

confidence: 99%

Automation of slice thickness measurements in computed tomography images of AAPM CT performance phantom using a non-rotational method

Ximenes

Anam

Hidayanto

et al. 2022

Polish Journal of Medical Physics and Engineering

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Purpose: The current study proposes a method for automatically measuring slice thickness using a non-rotational method on the middle stair object of the AAPM CT performance phantom image. Method: The AAPM CT performance phantom was scanned by a GE Healthcare 128-slice CT scanner with nominal slice thicknesses of 0.625, 1.25, 2.5, 3.75, 5, 7.5 and 10 mm. The automated slice thickness was measured as the full width at half maximum (FWHM) of the profile of the middle stair object using a non-rotational method. The non-rotational method avoided rotating the image of the phantom. Instead, the lines to make the profiles were automatically rotated to confirm the stair’s location and rotation. The results of this non-rotational method were compared with those from a previous rotational method. Results: The slice thicknesses from the non-rotational method were 1.55, 1.86, 3.27, 4.86, 6.58, 7.57, and 9.66 mm for nominal slice thicknesses of 0.625, 1.25, 2.4, 3.75, 5, 7.5, and 10 mm, respectively. By comparison, the slice thicknesses from the rotational method were 1.53, 1.87, 3.32, 4.98, 6.77, 7.75, and 9.80 mm, respectively. The results of the nonrotational method were slightly lower (i.e. 0.25%) than the results of the rotational method for each nominal slice thickness, except for the smallest slice thickness. Conclusions: An alternative algorithm using a non-rotational method to measure the slice thickness of the middle stair object in the AAPM CT performance phantom was successfully implemented. The slice thicknesses from the nonrotational method results were slightly lower than the rotational method results for each nominal slice thickness, except at the smallest nominal slice thickness (0.625 mm).

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“…Slice thickness is monitored as part of a regular quality control (QC) program. The purpose of QC is to regularly maintain a consistent image quality over the lifetime of the diagnostic radiology equipment and to ensure safe and accurate operation of the imaging process as a whole [9]. Importantly, it permits the identi cation of image quality degradation before it affects the interpretation of an image.…”

Section: Introductionmentioning

confidence: 99%

“…Importantly, it permits the identi cation of image quality degradation before it affects the interpretation of an image. QC is conducted to locate the source of any possible equipment malfunction and subsequently to conduct immediate maintenance requirements [9,10].…”

Section: Introductionmentioning

confidence: 99%

Automated slice sensitivity profile measurement of the CT image of the AAPM CT performance phantom: Which stair object should be used?

Lasiyah¹,

Anam²,

Hidayanto³

et al. 2021

Preprint

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Purpose: We used an improved algorithm to automatically measure the slice sensitivity profile (SSP) and its full-width at half maximum (FWHM) from all three stair objects within an image of the AAPM CT performance phantom.Methods: The phantom was scanned with a Philips Ingenuity 128-slice CT scanner using slice thicknesses of 1 mm and 5 mm. The three stair objects were named top #1, middle #2, and bottom #3. The software was able to measure the SSP and its FWHM form object #1, #2, #3, and all objects. The SSPs and FWHMs from each stair object were compared with manual measurements. Results: The FWHM values for a slice thickness of 1 mm were 1.3 ± 0.1 mm for all the stair objects. The FWHM values for a slice thickness of 5 mm were 5.2 ± 0.1 mm, 5.1 ± 0.3 mm, 5.2 ± 0.1 mm for the top, bottom, and middle stair objects, respectively. The results of manual measurements had the same trend as those of the automated measurements.Conclusion: The improved algorithm for measuring SSP and its FWHM from any stair object within the AAPM performance phantom was successfully developed. The SSPs and their FWHM values measured from every stair object were similar (p > 0.05).

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Procedures for Evaluation of Slice Thickness in Medical Imaging Systems

Cited by 6 publications

References 13 publications

An evaluation of automated measurement of slice sensitivity profile of computed tomography image: field of view variations

An evaluation of automated measurement of slice sensitivity profile of computed tomography image: field of view variations

Automation of slice thickness measurements in computed tomography images of AAPM CT performance phantom using a non-rotational method

Automated slice sensitivity profile measurement of the CT image of the AAPM CT performance phantom: Which stair object should be used?

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