1
|
Bushra A, Sulieman A, Edam A, Tamam N, Babikir E, Alrihaima N, Alfaki E, Babikir S, Almujally A, Otayni A, Alkhorayef M, Abdelradi A, Bradley DA. Patient's effective dose and performance assessment of computed radiography systems. Appl Radiat Isot 2023; 193:110627. [PMID: 36584412 DOI: 10.1016/j.apradiso.2022.110627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 12/17/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
Computed tomography is widely used for planar imaging. Previous studies showed that CR systems involve higher patient radiation doses compared to digital systems. Therefore, assessing the patient's dose and CR system performance is necessary to ensure that patients received minimal dose with the highest possible image quality. The study was performed at three medical diagnostic centers in Sudan: Medical Corps Hospital (MCH), Advance Diagnostic Center (ADC), and Advance Medical Center (AMC). The following tools were used in this study: Tape measure, Adhesive tape, 1.5 mm copper filtration (>10 × 10 cm), TO 20 threshold contrast test object, Resolution test object (e.g., Huttner 18), MI geometry test object or lead ruler, Contact mish, Piranha (semiconductor detector), Small lead or copper block (∼5 × 5 cm), and Steel ruler, to do a different type of tests (Dark Noise, Erasure cycle efficiency, Sensitivity Index calibration, Sensitivity Index consistency, Uniformity, Scaling errors, Blurring, Limiting spatial Resolution, Threshold, and Laser beam Function. Entrance surface air kerma (ESAK (mGy) was calculated from patient exposure parameters using DosCal software for three imaging modalities. A total of 199 patients were examined (112 chest X rays, 77 lumbar spine). The mean and standard deviation (sd) for patients ESAK (mGy) were 2.56 ± 0.1 mGy and 1.6 mGy for the Anteroposterior (AP) and lateral projections for the lumbar spine, respectively. The mean and sd for the patient's chest doses were 0.1 ± 0.01 for the chest X-ray procedures. The three medical diagnostic centers' CR system performance was evaluated and found that all of the three centers have good CR system functions. All the centers satisfy all the criteria of acceptable visual tests. CR's image quality and sensitivity were evaluated, and the CR image is good because it has good contrast and resolution. All the CR system available in the medical centers and upgraded from old X-ray systems to new systems, has been found to work well. The patient's doses were comparable for the chest X-ray procedures, while patients' doses from the lumbar spine showed variation up to 2 folds due to the variation in patients' weight and X-ray machine setting. Patients dose optimization is recommended to ensure the patients received a minimal dose while obtaining the diagnostic findings.
Collapse
Affiliation(s)
- A Bushra
- Radiation Safety Institute, Sudan Atomic Energy Commission, Khartoum, Sudan
| | - A Sulieman
- Prince Sattam bin Abdulaziz University, College of Applied Medical Sciences, Radiology and Medical Imaging Department, P.O.Box 422, Alkharj 11942, Saudi Arabia.
| | - A Edam
- Radiation Safety Institute, Sudan Atomic Energy Commission, Khartoum, Sudan
| | - N Tamam
- Physics Department, College of Science, Princess Nourah bint Abdulrahman University, P.O Box 84428, Riyadh, 11671, Saudi Arabia
| | - E Babikir
- Radiologic Technology Program, Allied Health Department, College of Health and Sport Sciences, University of Bahrain, Bahrain
| | - N Alrihaima
- Radiation Safety Institute, Sudan Atomic Energy Commission, Khartoum, Sudan
| | - E Alfaki
- Radiation Safety Institute, Sudan Atomic Energy Commission, Khartoum, Sudan
| | - S Babikir
- Radiation Safety Institute, Sudan Atomic Energy Commission, Khartoum, Sudan
| | - A Almujally
- Department of Biomedical Physics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Ahmed Otayni
- Radiology Department, King Khaled Hospital and Prince Sultan Center for Health Care, Ministry of Health, Alkharj, Saudi Arabia
| | - M Alkhorayef
- Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, P.O Box 10219, Riyadh, 11433, Saudi Arabia
| | - A Abdelradi
- Radiation Safety Institute, Sudan Atomic Energy Commission, Khartoum, Sudan
| | - D A Bradley
- Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, UK; Centre for Applied Physics and Radiation Technologies, School of Engineering and Technology, Sunway University, 47500, Bandar Sunway, Selangor, Malaysia
| |
Collapse
|
2
|
Ganeshan B, Miles KA, Babikir S, Shortman R, Afaq A, Ardeshna KM, Groves AM, Kayani I. CT-based texture analysis potentially provides prognostic information complementary to interim fdg-pet for patients with hodgkin's and aggressive non-hodgkin's lymphomas. Eur Radiol 2017; 27:1012-1020. [PMID: 27380902 PMCID: PMC5306313 DOI: 10.1007/s00330-016-4470-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 06/03/2016] [Accepted: 06/07/2016] [Indexed: 12/21/2022]
Abstract
OBJECTIVES The purpose of this study was to investigate the ability of computed tomography texture analysis (CTTA) to provide additional prognostic information in patients with Hodgkin's lymphoma (HL) and high-grade non-Hodgkin's lymphoma (NHL). METHODS This retrospective, pilot-study approved by the IRB comprised 45 lymphoma patients undergoing routine 18F-FDG-PET-CT. Progression-free survival (PFS) was determined from clinical follow-up (mean-duration: 40 months; range: 10-62 months). Non-contrast-enhanced low-dose CT images were submitted to CTTA comprising image filtration to highlight features of different sizes followed by histogram-analysis using kurtosis. Prognostic value of CTTA was compared to PET FDG-uptake value, tumour-stage, tumour-bulk, lymphoma-type, treatment-regime, and interim FDG-PET (iPET) status using Kaplan-Meier analysis. Cox regression analysis determined the independence of significantly prognostic imaging and clinical features. RESULTS A total of 27 patients had aggressive NHL and 18 had HL. Mean PFS was 48.5 months. There was no significant difference in pre-treatment CTTA between the lymphoma sub-types. Kaplan-Meier analysis found pre-treatment CTTA (medium feature scale, p=0.010) and iPET status (p<0.001) to be significant predictors of PFS. Cox analysis revealed that an interaction between pre-treatment CTTA and iPET status was the only independent predictor of PFS (HR: 25.5, 95% CI: 5.4-120, p<0.001). Specifically, pre-treatment CTTA risk stratified patients with negative iPET. CONCLUSION CTTA can potentially provide prognostic information complementary to iPET for patients with HL and aggressive NHL. KEY POINTS • CT texture-analysis (CTTA) provides prognostic information complementary to interim FDG-PET in Lymphoma. • Pre-treatment CTTA and interim PET status were significant predictors of progression-free survival. • Patients with negative interim PET could be further stratified by pre-treatment CTTA. • Provide precision surveillance where additional imaging reserved for patients at greatest recurrence-risk. • Assists in risk-adapted treatment strategy based on interim PET and CTTA.
Collapse
Affiliation(s)
- B Ganeshan
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK.
| | - K A Miles
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK
| | - S Babikir
- Human Health Division, Nuclear Medicine and Diagnostic Imaging Section, International Atomic Energy Agency (IAEA), Vienna, Austria
| | - R Shortman
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK
| | - A Afaq
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK
| | - K M Ardeshna
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK
| | - A M Groves
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK
| | - I Kayani
- Institute of Nuclear Medicine, University College London, Euston Rd, London, UK
| |
Collapse
|