Dosimetric comparison of stereotactic radiosurgery to intensity modulated radiotherapy

Kramer, Bradley; Wazer, David E.; Engler, Mark J.; Tsai, Jason Sheng‐Hong; Ling, Marilyn N.

doi:10.1002/(sici)1520-6823(1998)6:1<18::aid-roi3>3.0.co;2-l

Cited by 46 publications

(9 citation statements)

References 18 publications

(20 reference statements)

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“…Figure 1 shows the distribution of citations. References (Seymour & Mothersill 1997; Sheridan et al 1997; Desai et al 1998; Schmidt-Ullrich et al 1999; Smith & Haffty 1999; Johnson et al 1998; Monga et al 1999; Stickle et al 1999; Merrick et al 1998; Roach et al 1997; Wazer et al 1999; Joschko et al 1997; Chidel et al 1999; Durand & Olive 1997; Peschel et al 1999; Norman et al 1997; Kramer et al 1998; Leborgne et al 1997; Epperly et al 1999; Chancy et al 1998; Prete et al 1998; Fernandez-Vicioso et al 1997; Kang & Suh 1999; Banasiak et al 1999; Nathu et al 1998; Haffty et al 1997; Gieger et al 1997) and Table 1 include the 25 most frequently cited articles (all had at least 30 citations and were published in volumes 5-7, most emanated from the USA). The most frequently cited article in the first 4 volumes achieved 23 citations (Teicher et al 1996).…”

Section: Resultsmentioning

confidence: 99%

Scientific impact of studies published in temporarily available radiation oncology journals: a citation analysis

et al. 2015

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The purpose of this study was to review all articles published in two temporarily available radiation oncology journals (Radiation Oncology Investigations, Journal of Radiosurgery) in order to evaluate their scientific impact. From several potential measures of impact and relevance of research, we selected article citation rate because landmark or practice-changing research is likely to be cited frequently. The citation database Scopus was used to analyse number of citations. During the time period 1996-1999 the journal Radiation Oncology Investigations published 205 articles, which achieved a median number of 6 citations (range 0-116). However, the most frequently cited article in the first 4 volumes achieved only 23 citations. The Journal of Radiosurgery published only 31 articles, all in the year 1999, which achieved a median number of 1 citation (range 0-11). No prospective randomized studies or phase I-II collaborative group trials were published in these journals. Apparently, the Journal of Radiosurgery acquired relatively few manuscripts that were interesting and important enough to impact clinical practice. Radiation Oncology Investigations’ citation pattern was better and closer related to that reported in several previous studies focusing on the field of radiation oncology. The vast majority of articles published in temporarily available radiation oncology journals had limited clinical impact and achieved few citations. Highly influential research was unlikely to be submitted during the initial phase of establishing new radiation oncology journals.

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Section: Resultsmentioning

confidence: 99%

Scientific impact of studies published in temporarily available radiation oncology journals: a citation analysis

et al. 2015

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“…Arc: gantry arc, OARs: organs at risk. 5,6,8,10,13,18,20) and recent studies compared the dose conformity of dynamic 3D-CRT with IMRT 7,9,14,19) but little attention has focused on the OARs, especially in the CNS. 3) Patients with CNS tumors and other tumors around the CNS were enrolled in this study because these tumors were very close to the OARs.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Intensity Modulated Radiotherapy and Dynamic Three-Dimensional Conformal Radiotherapy With Regard to Dose Distribution and Sparing of Organs at Risk

Hasegawa

Iuchi

Osato

et al. 2011

Neurol. Med. Chir.(Tokyo)

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Dose escalation to the target while sparing the organs at risk near the lesion has been difficult over the last decade. However, recent radiotherapy techniques can deliver more sophisticated doses to the target. This study evaluated whether intensity modulated radiotherapy can deliver more homogeneous and conformal doses to the target than dynamic three-dimensional conformal radiotherapy while sparing organs at risk near the lesion in 13 patients with central nervous system tumors and other tumors around the central nervous system. Dynamic three-dimensional conformal radiotherapy and intensity modulated radiotherapy plans were calculated and dose distributions were compared for all patients with regard to the planning target volume and organs at risk. The plan of intensity modulated radiotherapy was significantly superior to that of dynamic three-dimensional conformal radiotherapy in target dose conformity (p ＝ 0.0006) and organs at risk sparing (p ＝ 0.0257). Intensity modulated radiotherapy could deliver more homogeneous and conformal doses to the target than dynamic three-dimensional conformal radiotherapy with sparing organs at risk near the lesion and may improve local control of radioresistant tumors via dose escalation.

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“…25,26 A comparison of dose distributions has been made between stereotactic radiosurgery and IMRT with dynamic MLC. 27 Output factors for some small symmetric and asymmetric fields pertinent to IMRT have also been reported. 28 Particularly, the problem of underdosage of the upper airway mucosa for small fields in IMRT has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Lateral loss and dose discrepancies of multileaf collimator segments in intensity modulated radiation therapy

2003

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In the step-and-shoot technique delivery of intensity modulated radiation therapy (IMRT), each static field consists of a number of beamlets, some of which may be very small. In this study, we measured the dose characteristics for a range of field sizes: 2 x 2 to 12 x 10 cm2 for 6 and 15 MV x rays. For a given field length, a number of treatment fields are set up by sequentially increasing the field width using a multi leaf collimator. A set of fields is delivered with the accelerator operated in the IMRT mode. Using an ion chamber, the output factors at 1 cm and 3 cm laterally from a field edge are measured at different depths in a solid water phantom. Our results show that with insufficient lateral distance in at least one direction, the absorbed dose never reaches the equilibrium values, and can be significantly lower for very small field sizes. For example, the output factor of the 2 x 2 cm2 field relative to 10 x 10 cm2 at d(max0 is 0.832 and 0.790 for 6 MV and 15 MV x rays, respectively. Multiple output factor curves are obtained for different field lengths and different buildup conditions. Thus under nonequilibrium conditions, output factors are critically dependent on the field size and the conventional method of determining the equivalent square does not apply. Comparison of output factors acquired in the commissioning of the accelerator with those measured in the present study under conditions of nonequilibrium shows large discrepancies between the two sets of measurements. Thus monitor units generated by a treatment planning system using beam data commissioned with symmetric fields may be underestimated by > 5%, depending on the size and shape of the segments. To facilitate manual MU calculation as an independent check in step-and-shoot IMRT, the concept of effective equivalent square (EES) is introduced. Using EES, output factors can be calculated using existing beam data for fields with asymmetric collimator settings and under conditions of lateral disequilibrium.

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Dosimetric comparison of stereotactic radiosurgery to intensity modulated radiotherapy

Cited by 46 publications

References 18 publications

Scientific impact of studies published in temporarily available radiation oncology journals: a citation analysis

Scientific impact of studies published in temporarily available radiation oncology journals: a citation analysis

Comparison of Intensity Modulated Radiotherapy and Dynamic Three-Dimensional Conformal Radiotherapy With Regard to Dose Distribution and Sparing of Organs at Risk

Lateral loss and dose discrepancies of multileaf collimator segments in intensity modulated radiation therapy

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