| Course | HS865 Doctoral Project II: Research |
|---|---|
| Unit | Unit 4 |
| Paper type | Thematic literature review |
| Length | About 1,100 words, 6 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | Doctor of Health Science (DHSc) |
| Updated | October 2026 |
Free sample paper for HS865 Unit 4
Settled Physics, Persistent Habit: A Unit 4 Thematic Literature Review on Why Radiographers Keep Gonadal Shielding
[Student Name]
Purdue University Global
HS865: Doctoral Project II: Research
Unit 4 Thematic Literature Review
[Instructor Name]
[Date]
The review is composite and its count of included studies is a placeholder; every study cited is real.
Introduction and Scope
This review examines the evidence on gonadal shielding in projection radiography after professional guidance changed. It draws on [23] studies identified through a logged search of four databases, two hand-searched journals and gray literature, using a later start date (2019) for practice studies than for dose and anatomy studies (2000). Studies are organized by theme rather than by author, following the synthesis matrix built in the previous unit. Each theme states a claim, presents the evidence and grades its strength.
Theme One: The Physics and Anatomy Case Against Routine Shielding Is Settled
The rationale for routine gonadal shielding has weakened on three fronts, and no included study contradicts any of them. First, the reproductive organs now carry less weight in estimates of radiation risk than when shielding became routine, and doses from modern digital projection radiography are low. Marsh and Silosky (2019) summarize this shift and argue that shielding has become a legacy practice whose benefits are minimal.
Second, shields often miss their target. An audit of pediatric hip and pelvis radiographs found shields frequently placed inaccurately (Fawcett & Barter, 2009). A later study using pelvic MRI explained part of the reason: ovaries in the youngest girls frequently sat above the true pelvis, out of a standard shield's reach, and their position shifted as the bladder filled (Fawcett et al., 2012).
Third, shields can cause harm. When a shield enters the area sampled by automatic exposure control, the system may raise exposure for the whole image, and a shield that covers anatomy the examination was meant to show can force a repeat exposure (Marsh & Silosky, 2019). Misplaced shields obscuring orthopedic landmarks were documented directly in the pediatric audit (Fawcett & Barter, 2009).
Strength: strong for anatomy and placement, which rest on direct observation; moderate for dose effects, which rely partly on modeling and phantom work.
By the time professional bodies recommended ending routine shielding, the case against it was already made; what remained unexplained was why the practice outlived its reasons.
Theme Two: Shielding Was Still Being Taught, and Taught Practice Persists
The practice continued in education right up to the change. Among the 27 educators who answered an international questionnaire, 15 still taught routine gonad shielding for many examinations, and educators believed that clinical placements, where students copy working radiographers, shape habits more than lectures do (Shanley & Matthews, 2018). The newest practice study included here, a survey of European radiographers fielded after both the 2019 and 2021 statements, was designed to measure how widely contact shielding persists in practice (Federico et al., 2026). Across the included practice surveys, [11] reported continued routine shielding by a meaningful share of respondents after 2019.
The evidence here is moderate. Surveys differ in who they sampled, how they worded questions and when they were fielded, so their prevalence figures are not directly comparable, a problem the next seminar will examine. But the direction is consistent: shielding did not stop when guidance changed.
Theme Three: Knowledge Is Not the Main Barrier
The most important pattern in the matrix is that radiographers who shield usually know the guidance has changed. In [8] of the [10] included studies that measured knowledge, a majority of respondents correctly identified current recommendations, including many who reported shielding routinely. This weakens the explanation most often assumed in commentary, that shielding persists because radiographers have not been told. If knowledge were the barrier, education campaigns would be the remedy. The evidence suggests they are not enough.
Where studies asked why informed radiographers shield, three reasons recurred: patients and parents expect or request it, colleagues and supervisors still do it, and the shield is part of the room's routine. These are social and environmental factors, not informational ones. Strength: moderate; the reasons come from survey items and a few qualitative studies, none designed around a theory of behavior.
Theme Four: De-implementation Research Predicts This Pattern
Research outside radiography helps explain the pattern. Stopping an established practice is not the reverse of adopting a new one. Prasad and Ioannidis (2014) describe how practices that are contradicted or unproven often persist because of habit, patient expectation, professional identity and the absence of a clear replacement action. Norton and Chambers (2020) argue that de-implementation requires attention to multiple levels, the practice itself, the clinicians, the patients and the organization, and to the type of change sought, whether removing, replacing, reducing or restricting the practice. Gonadal shielding fits this account closely. Removing the shield leaves a gap in a routine that patients can see and may question, and nothing replaces the visible act of protection.
Strength: the de-implementation literature is conceptual and draws on other clinical practices, so it predicts rather than demonstrates what happens in radiography.
How the Themes Relate
The four themes form a chain. The first establishes that the practice should change. The second shows it has not. The third rules out the simplest explanation for the gap. The fourth offers a better one, borrowed from research on stopping other entrenched practices. Read in order, they move the problem from radiation physics to human behavior, which is where a health science study can contribute. The chain also explains why the review gives little space to further dose studies: more evidence that shielding is unnecessary would add little to a case already made, while evidence about why informed professionals continue would add a great deal. For practice leaders, the implication is direct. Campaigns that repeat the guidance are likely to reach people who already know it, and efforts would be better aimed at the room, the routine and the conversation with the patient.
The Unasked Question
Taken together, the themes produce a question no included study has asked: which behavioral determinants, beyond knowledge, sustain routine gonadal shielding among radiographers after the guidance changed? The studies describe prevalence and list reasons, but none measures determinants systematically with a validated framework, and none combines a survey with interviews to explain how determinants operate in the room. The next unit will select a framework for doing so.
Limits of the Review
The review includes English-language studies only. American departments are underrepresented among the practice surveys, and their regulatory history differs. Several included studies are small, and none was designed to test explanations.
References
Fawcett, S. L., & Barter, S. J. (2009). The use of gonad shielding in paediatric hip and pelvis radiographs. The British Journal of Radiology, 82(977), 363-370. https://doi.org/10.1259/bjr/86609718
Fawcett, S. L., Gomez, A. C., Barter, S. J., Ditchfield, M., & Set, P. (2012). More harm than good? The anatomy of misguided shielding of the ovaries. The British Journal of Radiology, 85(1016), e442-e447. https://doi.org/10.1259/bjr/25742247
Federico, L., Roletto, A., Manzo, L., Canulli, L., Nieri, I., Panci, S., Catania, D., Rainford, L., & Gerasia, R. (2026). Survey on the use of patient contact shielding during radiological practice: The European radiographers' perspective. Radiography, 32(1), 103241. https://doi.org/10.1016/j.radi.2025.103241
Marsh, R. M., & Silosky, M. (2019). Patient shielding in diagnostic imaging: Discontinuing a legacy practice. American Journal of Roentgenology, 212(4), 755-757. https://doi.org/10.2214/AJR.18.20508
Norton, W. E., & Chambers, D. A. (2020). Unpacking the complexities of de-implementing inappropriate health interventions. Implementation Science, 15, 2. https://doi.org/10.1186/s13012-019-0960-9
Prasad, V., & Ioannidis, J. P. A. (2014). Evidence-based de-implementation for contradicted, unproven, and aspiring healthcare practices. Implementation Science, 9, 1. https://doi.org/10.1186/1748-5908-9-1
Shanley, C., & Matthews, K. (2018). A questionnaire study of radiography educator opinions about patient lead shielding during digital projection radiography. Radiography, 24(4), 328-333. https://doi.org/10.1016/j.radi.2018.04.001
What the HS865 Unit 4 assignment asks for
The fourth unit commonly asks candidates to write the thematic literature review for their doctoral project, often eight to twelve pages built on the matrix from the previous unit. Each theme should state a claim, present the evidence for and against it and grade its strength. Instructors expect synthesis across studies rather than one paragraph per article, and they look for a clear line from the themes to the gap the project will address. Literature from outside the home field is often appropriate when it explains something the home literature cannot. Most prompts ask candidates to note limits of the evidence and of the review itself. The review should end by stating the question that the evidence leaves open, in terms the methodology can answer.
Inside the HS865 Unit 4 example
An introduction states scope, search dates and the number of included studies. Theme one gathers evidence on reduced gonadal risk weights, shield misplacement in a pediatric audit, ovary position in young girls and shields that interfere with exposure control, with a strength grade; the highlighted sentence states what remained unexplained. Theme two reports educator and practice survey evidence and notes why rates cannot be compared. Theme three shows that most radiographers who shield know the guidance and lists social and environmental reasons. Theme four applies two de-implementation papers. A section explains how the themes form a chain, followed by the unasked question and the review's limits.
Reading the HS865 Unit 4 grading rubric
Thematic reviews at this level are typically evaluated on the quality of the themes, depth of synthesis, critical appraisal of evidence, coherence of the argument and the clarity of the gap. Synthesis usually carries the most weight; themes should be built from claims supported by several studies, not from individual articles. Critical appraisal earns credit when each theme's evidence is graded and its limits noted. Coherence rewards reviews whose themes connect logically and lead to a single open question. Bringing in relevant research from outside the field can raise the score when it explains a pattern the home literature leaves unexplained. A precise statement of the gap, honest limits and correct APA style complete the grade.
HS865 Unit 4 help: mistakes that cost points
The most frequent weakness is a review organized as a sequence of article summaries with headings added. Another is themes that describe topics, such as dose or education, without making claims. Some candidates present only evidence that supports their project and leave out contradicting studies. Others end the review without stating what remains unknown, which leaves the methodology unanchored. Over-reliance on commentary and opinion pieces weakens the evidence base. If your review addresses another practice that persists against guidance, perhaps routine pre-operative testing or urinary catheter use, send your matrix and question, and a thematic review can be drafted that builds each theme from a claim.
Get an HS865 Unit 4 example written to your instructions
Thematic reviews in HS865 vary in length and in how much Unit 2 method they restate. Attach the Unit 4 instructions, the rubric, your matrix or source list, and the question the review serves. Each theme in the sample opens with a claim your sources can support, and disagreement is explained rather than averaged. First custom sample free, returned inside 24-48h. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
More HS865 papers and DHSc samples
- HS865 Unit 1: Summary Versus Synthesis Post
- HS865 Unit 2: Literature Search Strategy Log
- HS865 Unit 3: Shielding Literature Synthesis Matrix
- HS865 Unit 5: Theoretical Framework Section
- HS865 Unit 6: Seminar Reflection
- HS865 Unit 7: Gap Statement
- HS865 Unit 8: Methodology Draft
- HS865 Unit 9: Instrument Alignment Table
- HS865 Unit 10: Review Chapter Draft
- HS860 Unit 4: Purpose and Research Question Alignment
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HS865 Unit 4 questions, answered
How many themes should a doctoral literature review have?
As many as the argument needs, which for a focused question is often three to five. Each theme should make a claim the question depends on. If two themes could swap evidence without anyone noticing, they are probably one theme; if a theme needs subheadings for unrelated findings, it may be two. Order them so the gap follows from the last.
Should a review include research from outside my field?
When it explains something the home literature cannot. Radiography studies describe shielding persistence well but rarely explain it, and research on removing low-value practices elsewhere in health care supplies that frame. Borrowed evidence should be labeled as borrowed, with a sentence on why it should transfer to your setting and where it might not.
Can a review criticize guidance from a professional body?
Yes, on the evidence. Examining the studies behind a position statement, limits included, is part of establishing what is settled. This review accepts the dose case while noting that the image quality audits come from few centers. Keep criticism proportionate and cited; a committee will expect any disagreement with a professional statement to rest on stronger evidence than the statement itself.
Where can I find a free HS865 Unit 4 sample paper?
This page presents the complete Unit 4 thematic review on why radiographers keep gonadal shielding, organized into four claim-led themes.
Why does the review bring in de-implementation research?
Because radiography studies describe shielding's persistence but do not explain it, and research on stopping other entrenched practices predicts the pattern they report.