TH-C-J-6B-10: 4D Cone Beam Digital Tomosynthesis (CBDT) and Digitally Reconstructed Tomograms (DRTs) for Improved Image Guidance of Lung Radiotherapy
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Purpose: The purpose of this work is to devise an efficient, effective and routine imaging modality to guide lung radiotherapy. Current methods involve acquiring a 4D-CBCT and comparing the digitally reconstructed radiographs (DRRs) for multiple breathing phases with online fluoroscopic images. A major shortcoming of DRRs and fluoroscopy is that unwanted structures such as bones occlude the target. Furthermore 4D-CBCT requires long acquisition times and large patient dose, making it impractical for routine use. Method and Materials: We propose a partial arc cone beam acquisition, which we call “cone beam digital tomosynthesis” (CBDT), to obtain cross-sectional images of a slab just thick enough to enclose the soft tissue target. Projections through this slab make “digitally reconstructed tomograms” (DRTs). Similar to DRRs, DRTs correct for beam divergence. However, different from DRRs, DRTs do not contain irrelevant structures outside the slab, making the target far more conspicuous. By gating this acquisition, dynamic cross sections and DRTs are obtained at multiple respiratory phases. These dynamic images are registered with those obtained from the planning 4D-CT dataset to guide treatment. Results: The DRRs constructed from multiple phases of a 4D-CT emphasize bony anatomy and other irrelevant structures overlaying the target, making the edges of the target difficult to find. We have demonstrated that this difficulty is overcome by the use of cross-sectional images from CBDT and DRTs, which are obtained with an image acquisition time that is significantly shorter than full-volume 4D-CBCT. Matching DRTs were obtained from the planning 4D-CT for each phase. 2D-2D registrations were performed to obtain the phase-varying offset. Conclusion: A new imaging technique has been introduced for image-guided lung treatment. With this approach, images are acquired faster and the appearance of the tumor is significantly enhanced by eliminating many extraneous structures. Conflict of Interest: This work is supported by Siemens.Keywords:
Tomosynthesis
Image-guided radiation therapy
Digital radiography
Tomosynthesis
Tomographic reconstruction
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With the increasing use of digital breast tomosynthesis imaging, the accuracy and quality control of mammography systems is gaining importance because of the need for high image stability and quality.We focused on the accuracy and quality control of mammography systems using digital breast tomosynthesis and proposed a simple method of maintaining and controlling the accuracy of half-value layer (HVL) measurements.The European Reference Protocol for the Quality Control of the Physical and Technical Aspects of Digital Breast Tomosynthesis Systems guidelines state that HVL measurements should be performed annually; however, this would not reveal daily changes in X-ray output.Changes in HVL are important indicators for determining changes in tube voltage and considering radiation doses associated with radiography.We investigated a simple control method to measure HVL by photographing an aluminium step for routine quality control of mammography systems.The proposed HVL measurement on the aluminium step enables HVL measurement for short-term control.Moreover, it is inexpensive and allows for a straightforward evaluation of X-ray quality.Thus, this method can be used for simpler routine equipment management as the presence or absence of fluctuations can be confirmed with a single image of the aluminium step and by determining the dose.
Tomosynthesis
Digital radiography
Digital Breast Tomosynthesis
Value (mathematics)
Half-value layer
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Poster: ECR 2010 / C-1301 / Digital tomosynthesis, standard computed and direct digital radiography, and CT in imaging of the renal tract: a comparison of the effective doses and clinical application by: K. J. Eckloff1, S. Evans2, B. Huey3, J. Hamill3, S. Phillips1; 1Bridgend/UK, 2Swansea/UK, 3Cardiff/UK
Tomosynthesis
Digital radiography
Conventional radiography
Computed radiography
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Poster: ECR 2015 / B-1108 / Anatomical noise and impact on lung nodule conspicuity: comparing digital radiography, dual-energy x-ray, and digital angular tomosynthesis by: Richard1, S. Sajja2, X. Wang1, L. Vogelsang1, N. Paul2; 1Rochester, NY/US, 2Toronto, ON/CA
Tomosynthesis
Digital radiography
Dual energy
Nodule (geology)
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본 연구는 기존의 Mammogram와 Tomosynthesis를 비교하여 진단적 가치를 평가하고 피검자의 유선선량을 비교하여 Tomosynthesis의 활용에 대해서 고찰해 보고자 하였다. 2015년 1월 한 달 동안 본원을 내원한 환자 62명을 대상으로 선행 검사를 시행한 후 어떤 병변이 있을 때 추가적으로 Tomosynthesis를 시행하였는지 분석하였다. 유방촬영용 ACR phantom을 이용하였으며 자동 노출이 되도록 설정된 상태에서 촬영한 kVp와 mAs를 기준으로 하여 kVp는 고정하고 mAs를 단계적으로 변화를 주어 유선선량을 분석하였다. 그 결과 Tomosynthesis가 유방 병변 구별에 우수하였으며 2D Mammogram과 비교할 때 확연한 대조도 차이를 보였다. 또한 두 검사의 평균유선선량에서는 Mammogram(1.15 mGy)보다 Tomosynthesis(1.48 mGy)가 0.33 mGy정도 높았으나 추가검사의 불필요함으로 인해 장기적으로는 피폭선량이 감소하는 효과를 보였다. 그러므로 Tomosynthesis는 유방의 진단적 가치를 높임과 동시에 피폭선량을 줄일 수 있는 검사이며 향후 유방질환의 검사에 적합하게 적용되고 응용할 수 있을 것이다. This study evaluated the diagnostic value and compares the Mammogram Tomosynthesis, and as compared to the AGD, was studied with respect to utilization of Tomosynthesis. During January 2015 one month were enrolled patients admitted to 62 people present. The ACR phantom was used. AEC was set to be. kVp is fixed and given a step-by-step changing the mAs analyzed AGD. Tomosynthesis was superior to the distinction of breast lesions when compared with Mammogram showed a noticeable difference in contrast. AGD(Average Glandular Dose) was higher 0.33 mGy. However, in the long run, the dose was reduced. Tomosynthesis is therefore increase the diagnostic value of the breast, a examination that can reduce the dose.
Tomosynthesis
Digital Breast Tomosynthesis
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Fluoroscopy was adapted for medical use as early as radiography, and as such has claimed clinical physics support since the early years. Fluoroscopy, similar to mammography and radiography, has experienced and is currently experiencing a change from analogue to digital detectors. The analogue image intensifier (II) detectors are being replaced by flat panel systems. Flat-panel detectors have unique noise characteristics, in that noise tends to be a more significant issue at low doses than was exhibited in II systems. Digital signals from flat-panel detectors provide opportunities for temporal filtering as well as other post-processing functions that can affect image quality. Image quality can be more readily assessed, optimized, and tracked if quantified. The transition to digital technology enables more convenient quantitation of image quality. Digital technology has enabled a multiplicity of clinical applications for fluoroscopic systems. Performance monitoring is another emerging technology across imaging including fluoroscopy.
Flat panel detector
Digital radiography
Image intensifier
Flat panel
Digital Mammography
Digital Imaging
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It was proposed the optimization of operating parameters for digital X-ray tomosynthesis during the examination of race horses bones using a mobile system of X-ray tomosynthesis EqueTom. For measurements, a cattle joint phantom with test objects embedded in it was used. It was experimentally confirmed the contrast and resolution increasing of the test objects in slices of the tomosynthesis images of with increasing irradiation angle.
Tomosynthesis
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Poster: ECR 2009 / C-770 / Clinical feasibility of digital tomosynthesis in flat panel detector radiography for orthopedic patients by: H. Machida 1, T. Yuhara1, T. Mori1, E. Ueno1, M. Fujimura1, K. Suzuki1, S. Morita1, A. Masukawa1, J. Sabol2; 1Tokyo/JP, 2Waukesha, WI/US
Tomosynthesis
Flat panel detector
Digital radiography
Flat panel
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The purpose of this study was to evaluate the diagnostic quality of digital tomosynthesis (DT) images for pediatric imaging of the spine. We performed a phantom image rating study to assess the visibility of anatomical spinal structures in DT images relative to digital radiography (DR) and computed tomography (CT). We collected DT and DR images of the cervical, thoracic and lumbar spine using anthropomorphic phantoms. Four pediatric radiologists and two residents rated the visibility of structures on the DT image sets compared to DR using a four point scale (0 = not visible; 1 = visible; 2 = superior to DR; 3 = excellent, CT unnecessary). In general, the structures in the spine received ratings between 1 and 3 (cervical), or 2 and 3 (thoracic, lumbar), with a few mixed scores for structures that are usually difficult to see on diagnostic images, such as vertebrae near the cervical-thoracic joint and the apophyseal joints of the lumbar spine. The DT image sets allow most critical structures to be visualized as well or better than DR. When DR imaging is inconclusive, DT is a valuable tool to consider before sending a pediatric patient for a higher-dose CT exam.
Tomosynthesis
Digital radiography
Computed radiography
Visibility
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Objective To observe the manifestation of X-ray digital tomosynthesis and normal digital radiography in the diagnosis of sacrococcyxlatera injury,in order to find out the best way for diagnosis of sacrococcyslatern injury.Methods Both X-ray and digital tomosynthesis scanning were performed in 38 cases of sacrococcyxlatera injury.Two kinds of imaging were analyzed with regard to image quality and diagnosis of abnormal sacrococcyxlatera.Results Among the 38 cases,image quality of sacrococcyxlatera was better with digital tomosynthesis(excellent irnage rate was 93.8％) than with X-ray (positive diagnostic rate was 52.1％).Sixteen cases with sacrococcyxlatera fracture and/or dislocation were found by digital tomosynthesis scanning,and only 4 cases was found by X-ray.Conclusions X-ray digital tomosynthesis technique can improve the image quality of lateral position' s imaging of sacrococcyxlatera,it has low-dose radiation.So it is expected to become the preferred method in patient with sacrococcyxlatera injury.
Key words:
X-ray; Digital tomosynthesis; Sacrococcyxlatera injury
Tomosynthesis
Digital radiography
Digital Breast Tomosynthesis
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