The new image reconstruction algorithm (Precise Image, Philips Healthcare) has a strong potential to maintain sufficient image quality suitable for diagnosis with ultra-low dose (ULD) chest and abdomen-pelvis scans. The hypothesis is that the images obtained with the Precise Image algorithm for ULD acquisitions are of sufficient and suitable quality for the diagnosis of certain lung, abdominal-pelvic and bone lesions.
Recently a new image reconstruction algorithm based on Deep-learning has been developed (Precise Image, Philips Healthcare). Initial studies on phantoms have shown that this algorithm improves image quality and reduces patient dose compared to the iDose4 iterative reconstruction algorithm. Feasibility studies have validated the image quality for low-dose levels (LD). However, this algorithm has a strong potential to maintain sufficient image quality suitable for diagnosis with ultra-low dose (ULD) chest and abdomen-pelvis scans. The hypothesis is that the images obtained with the Precise Image algorithm for ULD acquisitions are of sufficient and suitable quality for the diagnosis of certain lung, abdominal-pelvic and bone lesions. The purpose of this study is to evaluate the concordance of the global quality of thoraco-abdominopelvic images of a ULD scan acquisition compared to a standard dose CT acquisition and measure the global agreement of the global quality of the images with a 4-point Likert scale. The ULD acquisition will allow a significant reduction in the X-ray dose delivered to patients compared to a standard dose conventional scanner. This reduction is estimated at 70%.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
116
In addition to the usual management (i.e. standard dose Computed Tomography), an Ultra-Low-Dose thoraco-abdominopelvic scan will be routinely performed.
CHU
Nîmes, France
Concordance of the global quality of thoraco-abdomino-pelvic images from an Ultra-Low-Dose scanner acquisition compared to a standard dose scanner acquisition
A 4-point Likert scale will be used to evaluate the overall image quality to see whether it is good enough to visualize the structures of interest and possible lesions. Overall image quality is rated as follows: 1. Completely interpretable without noise, smoothing, and/or artifact, 2. Completely interpretable with low artifacts and/or low level of noise or/and smoothing, 3. Interpretable with moderate noise and/or smoothing and moderate artifacts, 4. Uninterpretable
Time frame: Day 0
Distribution of image quality with the standard dose scanner
Distribution of image quality for each of the two examinations of interest (ULD scanner and standard dose scanner) and to estimate the frequency of good quality images (level 1-2) for each of the two examinations. 1. \- Fully interpretable without noise, smoothing and/or artifact, 2. \- Fully interpretable with low artifacts and/or low noise and/or smoothing, 3. \- Interpretable despite moderate noise and/or smoothing and moderate artifacts, 4. \- Not interpretable
Time frame: Day 0
Frequency of good quality images with the standard dose scanner
Distribution of image quality for each of the two examinations of interest (ULD scanner and standard dose scanner) and to estimate the frequency of good quality images (level 1-2) for each of the two examinations. Grouping of the variable into 2 classes for the estimation of the frequency of good quality (1-2) images:- 1-2 vs. 3-4
Time frame: Day 0
Distribution of image quality with the Ultra-Low-Dose scanner
Distribution of image quality for each of the two examinations of interest (ULD scanner and standard dose scanner) and to estimate the frequency of good quality images (level 1-2) for each of the two examinations. 1. \- Fully interpretable without noise, smoothing and/or artifact, 2. \- Fully interpretable with low artifacts and/or low noise and/or smoothing, 3. \- Interpretable despite moderate noise and/or smoothing and moderate artifacts, 4. \- Not interpretable
Time frame: Day 0
Frequency of good quality images with the Ultra-Low-Dose scanner
Distribution of image quality for each of the two examinations of interest (ULD scanner and standard dose scanner) and to estimate the frequency of good quality images (level 1-2) for each of the two examinations. Grouping of the variable into 2 classes for the estimation of the frequency of good quality (1-2) images:- 1-2 vs. 3-4
Time frame: Day 0
Confidence level of each radiologist's diagnosis : Ultra-Low-Dose scan acquisition
To compare the confidence level of each radiologist's diagnosis for each of the two examinations of interest (Ultra-Low-Dose scan and standard dose scan) a subjective assessment of the each radiologist's (Junior/Senior) diagnostic confidence level will be made.
Time frame: Day 0
Confidence level of each radiologist's diagnosis : Standard-Dose scan acquisition
To compare the confidence level of each radiologist's diagnosis for each of the two examinations of interest (Ultra-Low-Dose scan and standard dose scan) a subjective assessment of the each radiologist's (Junior/Senior) diagnostic confidence level will be made.
Time frame: Day 0
Inter-rater agreement (Senior vs. junior radiologist) regarding the Ultra-Low-Dose scan acquisitions
Likert scales for global image quality and the level of confidence of the diagnosis will be used to assess inter-rater agreement (senior radiologist vs. junior radiologist) for each CT acquisition.
Time frame: Day 0
Inter-rater agreement (Senior vs. junior radiologist) regarding the Standard-Dose scan acquisitions
Likert scales for global image quality and the level of confidence of the diagnosis will be used to assess inter-rater agreement (senior radiologist vs. junior radiologist) for each CT acquisition.
Time frame: Day 0
Overall concordance of the diagnosis. Thoracic lesions seen on the Ultra-Low-Dose scan
Overall concordance of the diagnosis of thoracic, abdominal and/or pelvic lesions made from a ULD scan or from a conventional standard dose scan in these patients. Presence of at least one thoracic, (Yes/No)
Time frame: Day 0
Overall concordance of the diagnosis. Thoracic lesions seen on the Standard-Dose scan
Overall concordance of the diagnosis of thoracic, abdominal and/or pelvic lesions made from a ULD scan or from a conventional standard dose scan in these patients. Presence of at least one thoracic lesion (Yes/No)
Time frame: Day 0
Overall concordance of the diagnosis. Abdominal lesions seen on the Ultra-Low-Dose scan
Overall concordance of the diagnosis of thoracic, abdominal and/or pelvic lesions made from a ULD scan or from a conventional standard dose scan in these patients. Presence of at least one abdominal lesion (Yes/No)
Time frame: Day 0
Overall concordance of the diagnosis. Abdominal lesions seen on the Standard-Dose scan
Overall concordance of the diagnosis of thoracic, abdominal and/or pelvic lesions made from a ULD scan or from a conventional standard dose scan in these patients. Presence of at least one abdominal lesion (Yes/No)
Time frame: Day 0
Overall concordance of the diagnosis. Pelvic lesions seen on the Ultra-Low-Dose scan
Overall concordance of the diagnosis of thoracic, abdominal and/or pelvic lesions made from a ULD scan or from a conventional standard dose scan in these patients. Presence of at least one pelvic lesion (Yes/No)
Time frame: Day 0
Overall concordance of the diagnosis. Pelvic lesions seen on the Standard-Dose scan
Overall concordance of the diagnosis of thoracic, abdominal and/or pelvic lesions made from a ULD scan or from a conventional standard dose scan in these patients. Presence of at least one pelvic lesion (Yes/No)
Time frame: Day 0
Overall concordance of the diagnosis. Spine lesions seen on the Ultra-Low-Dose scan
Overall concordance of the diagnosis of bone lesions of the spine and pelvis made from a ULD scan or from a standard dose CT scan in these patients. Presence of at least one bone lesion within the spine (Yes/No).
Time frame: Day 0
Overall concordance of the diagnosis. Spine lesions seen on the Standard-Dose scan
Overall concordance of the diagnosis of bone lesions of the spine and pelvis made from a ULD scan or from a standard dose CT scan in these patients. Presence of at least one bone lesion within the spine (Yes/No).
Time frame: Day 0
Overall concordance of the diagnosis. Pelvic bone lesions seen on the Ultra-Low-Dose scan
Overall concordance of the diagnosis of bone lesions of the spine and pelvis made from a ULD scan or from a standard dose CT scan in these patients. Presence of at least one bone lesion on the pelvis (Yes/No).
Time frame: Day 0
Overall concordance of the diagnosis. Pelvic bone lesions seen on the Standard-Dose scan
Overall concordance of the diagnosis of bone lesions of the spine and pelvis made from a ULD scan or from a standard dose CT scan in these patients. Presence of at least one bone lesion on the pelvis (Yes/No).
Time frame: Day 0
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