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External Beam RT Targets Tumors More Precisely

By MedImaging International staff writers
Posted on 20 Aug 2019
A new study shows that very high-energy electron (VHEE) beams could potentially enable clinicians to accurately target malignancies and reduce damage to surrounding tissues.

Researchers at the University of Strathclyde (United Kingdom), the National Physical Laboratory (NPL; Teddington, United Kingdom), and other institutions conducted a water phantom study (based on Monte Carlo simulations) of a magnetic “lens” that can focus particle beams within the body. Concentrating such a VHEE beam into a small, well-defined volumetric element, which can be shaped or scanned to treat deep-seated tumors, allows the dose to surrounding tissue to be distributed over a larger volume.

The result is reduced peak surface and exit doses by more than one order of magnitude, compared with a collimated beam. The magnetic lens, which is in effect an ultra-compact laser-wakefield accelerator, is only millimeters long, and can be easily focused. The researchers are now planning to expand the study and are setting up a medical beamline with high energy electron accelerators at the Scottish Centre for the Application of Plasma-based Accelerator (SCAPA; Strathclyde, United Kingdom). The study was published on July 25, 2019, in Nature Scientific Reports.

“Electrons, much like protons, have properties specific to particles. The significantly smaller electron mass, however, must be compensated for by increasing their energy, and therefore inertia, to achieve an effect similar to high mass particles,” said lead author Strathclyde PhD student Karolina Kokurewicz, MSc. “We push the envelope, showing that a VHEE beam, when focused, can be easily controlled to target precisely tumors similar to beam scanning modalities. The net effect is a greatly enhanced dose profile that conforms closely to the target volumes and potentially provides better tumor control.”

“One of the challenges in radiotherapy is to deposit a high radiation dose in a way that the dose fully ‘conforms’ to the tumor, to ensure that all cancerous cells are killed, while preventing damage to healthy cells,” said senior author Professor Dino Jaroszynski, PhD, of the University of Strathclyde department of physics. “In a similar way to a magnifying glass focusing the sun's rays to a small spot, we propose to focus a particle beam to a small spot using a magnetic lens to ablate the tumor.”

Common forms of radiation currently used in RT include bremsstrahlung X-rays produced by linear accelerators. These relatively low energy electron beams can be used directly to irradiate tumors, but they do not penetrate deeply into the body. To irradiate the tumor with sufficient radiation to kill all tumor cells, the X-ray beam is often rotated, while the patient remains stationary, thus superimposing multiple beams with different energies to produce a spread-out-Bragg peak region. This, however, results in an increased entrance dose, which could be avoided by focusing VHEE beams.

Related Links:
University of Strathclyde
National Physical Laboratory


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88 (!!!!! 5867.0043945312): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294779048 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (113.96408081055): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294779048 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (58.889389038086): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
91 (83.92333984375): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (72.956085205078): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (42.915344238281): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (44.822692871094): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (!!!!! 3789.9017333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (98.943710327148): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (122.0703125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
106 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
107 (446.79641723633): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294779048 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (458.0020904541): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294779048 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
110 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
111 (369.07196044922): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294779048 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 6222.9633331299): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294779048 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (585.07919311523): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (357.15103149414): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
115 (80.108642578125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
116 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
117 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
118 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
119 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
120 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
121 (226.97448730469): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
122 (!!!!! 38226.842880249): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
123 (!!!!! 4635.0955963135): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
124 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
125 (447.03483581543): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294779048 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294779048 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 988387.10784912): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (677.10876464844): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
128 (446.79641723633): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (674.00932312012): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
130 (277.04238891602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (383.13865661621): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
132 (356.91261291504): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (599.86114501953): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
134 (254.15420532227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (211.00044250488): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (104.18891906738): SELECT name FROM jos_deeppockets WHERE id=213
137 (61.988830566406): SELECT name FROM jos_deeppockets WHERE id=213
138 (493.04962158203): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (402.92739868164): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
141 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
142 (!!!!! 3723.8597869873): TRUNCATE TABLE jos_trademed_module
143 (203.84788513184): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294779048 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (97.036361694336): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294779048 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (417.94776916504): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (135.18333435059): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
148 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
149 (!!!!! 1165.8668518066): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
150 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
151 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
152 (291.10908508301): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294779048 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294779048 AND type='deeppockets_item' AND published='1' LIMIT 1
153 (85.830688476562): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=213 or channel_id is null)
154 (47.922134399414): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=213 or channel_id is null)
155 (51.975250244141): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
156 (120.87821960449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
157 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294779048 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294779048 AND published='1' LIMIT 1
158 (178.81393432617): select jos_twitters.link from jos_twitters where cat=10
159 (56.028366088867): select jos_facebook.link from jos_facebook where cat=10
160 (400.06637573242): select jos_google_plus.link from jos_google_plus where cat=10
161 (28.133392333984): select jos_linkedin.link from jos_linkedin where cat=10
162 (273.9429473877): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
163 (!!!!! 1573.8010406494): insert into jos_banners_delta values (14615,'2025-04-30 03:35:31','3.147.44.253','view'),(14202,'2025-04-30 03:35:31','3.147.44.253','view'),(14203,'2025-04-30 03:35:31','3.147.44.253','view')